Git Errors

This error occurs when Git cannot find or access a submodule that is referenced in your repository. The submodule exists in .gitmodules but has not been initialized in your local Git configuration, preventing Git from fetching the submodule content.

This error occurs when git-daemon refuses to serve a repository because it lacks the git-daemon-export-ok file or the --export-all flag is not set. The daemon requires explicit permission to export repositories over the git:// protocol.

Git refuses to merge because local files have uncommitted changes that would be overwritten. This typically occurs during pull, merge, or checkout operations when your working directory contains modifications that conflict with incoming changes.

This error occurs when Git bisect detects that the commit marked as 'good' is not an ancestor of the 'bad' commit. This typically happens when searching for a fix instead of a regression, or when good/bad commits are swapped.

This error appears when Git cannot access a remote repository due to authentication issues, missing permissions, or an incorrect URL. The fix typically involves verifying your credentials or requesting repository access.

This error occurs when Git detects an incomplete rebase or git am operation. The .git/rebase-apply directory tracks rebase state, and Git prevents new rebases when one is already in progress.

This error occurs when Git tries to switch branches or perform a rebase, but detects that untracked files in your working directory would be overwritten by files from the target branch. Git refuses to proceed to prevent accidental data loss.

Git fails to launch the text editor needed for commits, rebases, or other interactive operations. This happens when the configured editor is missing, incorrectly specified, or not in your system PATH.

This message appears when running git stash but Git finds no modified tracked files in your working directory. It typically occurs when you have only untracked files, or your working directory is already clean.

Git revert conflicts occur when the changes you're trying to undo have been modified by subsequent commits. Resolve conflicts by editing files, staging them, then completing the revert with --continue.

This Git error occurs when using git replace to substitute one object with another of a different type. Use the -f flag to force the replacement, or ensure both objects share the same type (commit, tree, blob, or tag).

This error occurs when you try to sign a Git commit or tag with SSH but haven't configured the required signing settings. The fix involves setting `gpg.format` to ssh and specifying your SSH public key as `user.signingkey`.

SSH refuses to use your config file because it has insecure file permissions or is owned by another user. Fix by setting correct ownership and restricting permissions to owner-only read/write.

This error occurs when you try to remove a file with git rm but the file has staged changes that differ from both the current working directory version and the last commit (HEAD). Git requires explicit confirmation to prevent accidental data loss.

The post-checkout hook script in your Git repository exited with a non-zero status code, indicating the hook failed during checkout, clone, or branch switch operations. This typically occurs due to permission issues, missing dependencies, or script errors.

This warning appears when running git filter-branch, indicating that the command is deprecated due to numerous safety and performance issues. Git recommends using git-filter-repo as a faster, safer alternative.

This error occurs when Git expects a symbolic reference (like HEAD pointing to a branch) but finds a direct commit SHA or corrupted reference instead. Most commonly happens in detached HEAD state or with corrupted .git files.

This error occurs when pushing to a remote repository from a shallow clone, or when the remote itself is shallow and rejects updates. The fix involves unshallowing your local repository or reconfiguring the remote to accept shallow updates.

The git for-each-ref command returns no matches when the pattern provided doesn't match any existing references in the repository. This commonly occurs due to incorrect ref path patterns or shell quoting issues.

Git cannot read or access the .git/info/exclude file, which stores local ignore patterns. This typically occurs due to missing file, incorrect permissions, or filesystem issues.

The 'fatal: repository not found' error occurs when Git cannot locate or access the specified remote repository. This typically happens due to an incorrect URL, insufficient permissions, missing authentication, or the repository being deleted or renamed.

Git cannot locate the configured diff tool in your PATH or the tool is not installed. This prevents git difftool from launching the visual diff application.

This Git error occurs when you attempt to apply, pop, or drop a stash but no stashes exist in your stash list. The stash may have already been applied, dropped, or was never created in the first place.

Git reports the index needs refresh when cached file metadata becomes stale or mismatched with the working tree, commonly after switching environments, interrupted operations, or cross-platform development.

Git server rejects your push because the repository or namespace has exceeded its storage quota limit. This commonly occurs on platforms like GitHub, GitLab, and Bitbucket when repositories grow too large or contain oversized files.

This error indicates repository corruption where an object file's content doesn't match its SHA-1 hash filename. Recovery typically involves replacing corrupt objects from a backup or recloning the repository.

This error occurs when git stash pop or git stash apply tries to reapply stashed changes that conflict with modifications made to your working directory since the stash was created. The conflict must be resolved manually before you can continue.

This Git error occurs when you try to push to a remote repository that has no common references with your local repository. It typically happens when pushing to an empty remote or when using git push without specifying a branch.

This error occurs when running git stash pop or git stash apply and Git cannot restore untracked files because files with the same names already exist in your working directory. Git refuses to overwrite existing files to prevent data loss.

This error occurs when you try to run git bisect commands like 'git bisect run', 'git bisect good', or 'git bisect bad' without first initializing a bisect session and providing both good and bad commit boundaries.

This message appears when Git determines that your branch already contains all commits from the target branch. While not technically an error, it often indicates your local references are out of sync with the remote repository.

This error occurs when Git detects that two branches or repositories have no common commit history. Git refuses the merge by default to prevent accidentally combining unrelated projects.

An add/add conflict occurs when two branches independently add a file with the same name. Git cannot automatically decide which version to keep, requiring manual resolution to choose one version, combine both, or rename one of the files.

This Git error occurs when rebasing onto a branch reference that Git cannot resolve to a valid commit. It typically happens when the remote branch has not been fetched locally or the branch name is misspelled.

This error occurs when Git cannot sign a commit using GPG. Common causes include an expired GPG key, misconfigured TTY, or wrong GPG program. Fixing typically involves setting GPG_TTY, restarting gpg-agent, or reconfiguring your signing key.

This Git error occurs when you try to delete, checkout, or reference a branch that doesn't exist in your repository. The branch may have been deleted, renamed, misspelled, or never fetched from the remote. Fix it by verifying the branch name and ensuring you've fetched the latest remote references.

This error occurs when Git cannot add a file to its staging index. Common causes include file locks from other applications, permission issues, antivirus interference, or a corrupted index file. The fix usually involves closing programs that lock the file or resetting the Git index.

This error occurs when using an outdated Git version (typically 1.8.x on CentOS 7) that doesn't properly support shallow clone operations. The fix is to upgrade Git to version 2.x or disable shallow cloning in your CI/CD configuration.

The 'Path does not exist in HEAD' error occurs when Git cannot find a specified file in the current commit. This happens with new untracked files, incorrect paths, or case sensitivity mismatches.

The git describe command fails when used with --match or --exact-match options and no tags match the specified pattern or commit. This occurs when trying to find a specific tag that describes the current commit.

This Git error occurs when Git cannot determine whether an argument is a branch name, commit reference, or file path. The specified reference doesn't exist locally, often because it was never fetched, was deleted, is misspelled, or the repository is a shallow clone. Fix it by verifying the branch exists and fetching from the remote.

This Git error occurs when HEAD cannot reference a valid commit, typically in a newly initialized repository with no commits, or when the HEAD reference has become corrupted. The fix usually involves making an initial commit or resetting HEAD to a valid branch.

Git warns about trailing whitespace when applying patches that add spaces or tabs at the end of lines. This is a code quality warning that can be fixed automatically or suppressed through configuration.

This informational message appears when creating the first commit on an orphan branch. Orphan branches intentionally have no parent commits, which is useful for gh-pages, fresh history starts, or separate project histories.

This error occurs when Git cannot resolve the revision range specified in git format-patch. Common causes include not having enough commits in the repository, working with a shallow clone, or referencing commits that don't exist.

GitHub no longer accepts account passwords for Git operations over HTTPS. Since August 2021, you must use a personal access token or SSH key to authenticate instead of your password.

Git refuses to run 'git clean' without a safety flag. This is an intentional safeguard to prevent accidental deletion of untracked files. Add -f, -n, or -i to proceed.

This error occurs when you try to use git rm on a file that Git is not tracking. The file may have already been deleted, never been added to Git, or you may have a typo in the filename.

This error occurs when Git cannot cleanly apply a patch file to your working directory because the file contents have changed since the patch was created. The fix involves using --3way merge, --reject flags, or adjusting context matching options.

Git is warning that your pre-commit hook file exists but lacks executable permissions. The hook is being skipped, so any pre-commit checks won't run. Fix it by making the file executable with chmod +x.

This error occurs when you run `git fetch --unshallow` on a repository that already has full history. The fix involves checking if the repository is shallow before attempting to unshallow it, typically by using conditional logic in CI/CD scripts.

This error occurs in CI/CD pipelines when Git cannot traverse the commit history due to shallow clone depth restrictions. The checkout commit exists outside the fetched history window, preventing Git from completing the revision walk.

This error occurs when Git cannot locate required objects during a shallow fetch operation. It typically happens when trying to update or deepen a shallow clone that references commits outside its truncated history. The fix involves unshallowing the repository, incrementally deepening the clone, or performing a fresh full clone.

This error occurs when attempting to deepen a shallow clone with git fetch --deepen on a Git server that lacks protocol support for the deepen capability. The deepen feature requires Git protocol version 2 support on the remote server.

Git operations fail when the connection to the remote repository times out. This typically occurs during clone, fetch, push, or pull operations when the client cannot establish or maintain a connection to the Git server within the allocated time.

This error occurs when Git LFS fails to download large file objects during checkout or clone operations. Common causes include missing LFS objects on the server, authentication issues, or network problems.

This error occurs when Git cannot locate or read an object file in its internal database. The fix involves verifying repository integrity, recovering missing objects from remotes or backups, or re-cloning the repository.

This error occurs when Git cannot create a worktree because the target directory already exists or is registered as an existing worktree. Fix it by removing the directory, pruning stale worktree references, or using the --force flag.

This error occurs when Git cannot write object files to the .git/objects directory due to filesystem issues, disk problems, or NTFS-specific limitations on Windows. The fix involves checking disk health, disabling NTFS compression, and ensuring proper filesystem access.

This error occurs when Git cannot find a file or directory matching the path you specified. Common causes include typos, wrong working directory, case sensitivity issues, or files excluded by .gitignore.

This error occurs when Git cannot verify the SSL certificate because the certificate's subject name (CN or SAN) does not match the hostname you are connecting to. This is most commonly caused by corporate SSL inspection proxies that intercept HTTPS traffic and re-sign it with their own certificates.

This error occurs when Git's commit-graph cache file becomes corrupted. The commit-graph is a performance optimization that can be safely deleted and regenerated without data loss.

Git suggests enabling rerere to automatically reuse conflict resolutions. This feature remembers how you resolved merge conflicts and reapplies those solutions when the same conflicts appear again.

This error occurs when a server-side Git hook (pre-receive, update, or post-receive) rejects your push operation, preventing reference updates on the remote repository.

This error occurs when Git cannot parse the filter specification provided to `git clone --filter` or `git fetch --filter`. Common causes include typos in the filter syntax, using unsupported filter types, or version mismatches between client and server.

This error occurs when you try to push directly to a protected branch on GitHub. Branch protection rules require changes to go through pull requests with reviews and passing status checks.

This error occurs when you have uncommitted changes in your working directory and try to run git bisect. Git bisect needs to checkout different commits during the binary search process, and local modifications would conflict with these checkouts.

The 'fatal: Paths with -a does not make sense' error occurs when you combine Git's -a (all) commit flag with explicit file paths. The -a flag already stages all tracked modified files, making additional path arguments contradictory. Remove either the -a flag or the file paths from your command.

The 'RPC failed; curl 56 GnuTLS' error occurs during Git operations over HTTPS when there's a TLS/SSL communication failure. This is commonly caused by network issues, large repository transfers, or GnuTLS library problems on Linux systems.

This Git error occurs when you try to operate on a file that Git cannot find or does not recognize. Common causes include typos in the filename, the file not being tracked by Git, or case sensitivity issues. The fix depends on whether you need to stage, unstage, or remove a file.

The 'Authentication failed' error occurs when Git cannot verify your credentials with the remote repository. This typically happens because GitHub no longer accepts password authentication for HTTPS, requiring you to use a Personal Access Token or switch to SSH authentication.

This error occurs when you try to push to a branch that doesn't exist locally, typically because no commits have been made yet or the branch name doesn't match between local and remote repositories.

This error occurs when Git cannot resolve a reference like HEAD~ because the repository has no commits, only one commit (no parent exists), or the reference is otherwise invalid. It commonly appears when trying to undo commits in a new repository.

This error occurs when Git cannot find the specified upstream branch during a rebase or other operation. The branch may not exist locally, needs to be fetched from the remote, or may have been renamed or deleted.

This status appears when a Git submodule contains new files that are not tracked by Git. Fix it by adding files to .gitignore, cleaning the submodule, or configuring Git to ignore untracked content in submodules.

This Git error prevents rebasing when you have modified files that aren't staged or committed. Git requires a clean working directory to safely apply commits during a rebase. The solution is to either stash your changes temporarily, commit them, or discard them if they're not needed.

The 'fatal: remote origin already exists' error occurs when you try to add a remote repository with a name that's already configured. Fix it by updating the existing remote URL, removing and re-adding the remote, or using a different remote name.

This error occurs when Git cannot establish a connection to the remote repository. Common causes include SSH key issues, incorrect repository URLs, missing access permissions, or network problems preventing the connection.

This error occurs when Git cannot verify SSL certificates because a corporate proxy intercepts HTTPS traffic and re-signs it with its own Certificate Authority. The proxy's CA certificate is not in Git's trust store, causing SSL verification to fail during clone, push, or pull operations.

This error occurs when Git cannot acquire a lock on the repository's index file because a lock file already exists. This usually means another Git process is running, or a previous Git process crashed without cleaning up. The fix is typically to remove the stale lock file after confirming no Git processes are active.

The 'SOCKS5 connection to proxy failed' error occurs when Git cannot establish a connection through your configured SOCKS proxy. This typically happens when the proxy server is not running, the configuration is incorrect, or the protocol (socks5 vs socks5h) is mismatched. The fix usually involves verifying your proxy is active or updating your Git proxy configuration.

This Git warning indicates that your file contains Windows-style line endings (CRLF) which will be converted to Unix-style line endings (LF) when committed. This is typically caused by Git's autocrlf setting and can be resolved by configuring line ending behavior.

This error occurs when you try to push to a branch that is currently checked out in a non-bare remote repository. Git prevents this to avoid making the remote working directory inconsistent. The fix involves either converting the remote to a bare repository or pushing to a different branch.

This error occurs when you try to access, apply, drop, or pop a stash entry that doesn't exist. Common causes include referencing a stash index that has already been dropped, shell escaping issues with curly braces, or a corrupted stash reflog.

This error occurs when Git fails to receive or process pack data during clone, fetch, or pull operations. It typically indicates a network interruption, insufficient memory, or issues with the data stream between the Git client and remote server.

This GPG error occurs when Git cannot use your GPG key for signing commits or tags. The key may be expired, lack signing capability, or have trust issues. Fixing it involves checking key status and renewing or reconfiguring the key.

This error occurs when you attempt to start a new merge while Git is already in a merge state with unresolved conflicts. You must first resolve the existing conflicts from the previous merge, stage the changes, and complete or abort that merge before starting a new one.

This error occurs when Git tries to use a custom diff driver specified in .gitattributes, but the driver command is not found or not properly configured in your Git config.

This error occurs when you try to add a remote named 'origin' using `git remote add origin`, but a remote with that name is already configured. The fix is to either update the existing remote URL, remove and re-add it, or rename the existing remote to something else.

This Git error occurs when you attempt to clone a repository into a directory that already exists and contains files. Git refuses to overwrite existing content to prevent accidental data loss.

This error indicates corruption in Git's index cache-tree extension, typically caused by interrupted operations or disk issues. The fix usually involves removing the corrupted index and resetting.

This error occurs when running git stash apply or git stash pop, and Git detects uncommitted local changes that conflict with the stashed changes. Git refuses to proceed to prevent data loss.

This warning occurs when Git cannot automatically merge changes to binary files like images, PDFs, or compiled binaries. Since Git can only insert conflict markers into text files, you must manually choose which version of the binary file to keep using git checkout --ours or --theirs.

This error occurs when Git is configured to sign commits or tags with GPG, but the GPG program is not installed or cannot be found. The fix involves either installing GPG, configuring the correct path to the GPG executable, or disabling commit signing if not needed.

This error occurs when you run a Git command outside of a Git repository. Git cannot find a .git directory in the current folder or any parent folder. You need to either navigate to an existing repository, initialize a new one with git init, or clone an existing repository.

Git cannot access the global gitignore file specified in core.excludesfile configuration. This warning appears when the configured path does not exist or is inaccessible.

This Git error occurs when Git's core.autocrlf or core.safecrlf settings prevent automatic line ending conversion. The safecrlf setting blocks changes that would irreversibly convert CRLF (Windows) line endings to LF (Unix), protecting your files from unintended modifications.

This error occurs when Git cannot locate or parse a stash reference, typically due to corrupted stash files, shell escaping issues with curly braces, or damage from git filter-branch operations. The fix involves repairing or clearing the stash.

This error occurs when you try to use Git on macOS but the Xcode Command Line Tools are not installed. macOS requires these developer tools for Git and other development utilities to function. The fix is simple: install the Command Line Tools using xcode-select --install.

This error occurs when Git cannot automatically apply a commit during a rebase because changes in the commit conflict with changes in the target branch. You must manually resolve the conflicts by editing the affected files, staging them, and continuing the rebase.

The macOS Keychain prompts you to allow git-credential-osxkeychain access to your stored credentials. This typically happens after upgrading Git via Homebrew, which changes the executable path and invalidates the previous authorization. You can fix this by re-authorizing the new path in Keychain Access or switching to SSH authentication.

Git attempts to display command output using a pager program (typically 'less') but cannot find or execute it. This causes Git commands like log, diff, and show to either fail or dump raw output directly to the terminal.

This error occurs when Git maintenance tries to run but cannot acquire a lock because another maintenance process is already running or a stale lock file exists from a previous operation.

The 'unexpected disconnect while reading sideband packet' error occurs when Git's network connection is interrupted during a fetch or clone operation. This typically indicates network instability, large repository issues, or buffer configuration problems.

The 'fatal: missing tree' error occurs when Git cannot find a tree object referenced by a commit or another tree. This indicates repository corruption requiring recovery from backups or remote sources.

This error occurs when Git cannot push your local commits to the remote repository because your local branch is behind the remote. The fix usually involves pulling remote changes first, then pushing again.

This error occurs when Git cannot find a file, branch, or path that you specified in a command. It typically happens with git checkout, git add, git rm, or similar operations when the target doesn't exist in the repository or isn't being tracked. The solution involves verifying the path exists, checking for typos, or fetching remote branches.

Git ls-remote command fails when trying to query references from a remote repository, typically due to authentication issues, network problems, or incorrect repository URLs.

Git clone refuses to write into an existing non-empty directory to prevent data loss. You can either remove the existing folder, clone to a different location, or use git init with remote add as an alternative approach.

This error occurs when Git cannot verify the SSL/TLS certificate of a remote repository because the Certificate Authority (CA) that signed the certificate is not in your system's trust store. It commonly happens in corporate environments with proxy servers, on systems with outdated CA certificates, or when using self-signed certificates.

This error occurs when Git cannot identify you as a user because the required user.name and user.email configuration values are not set. Git needs this identity information to record who made each commit. The fix is straightforward: configure your name and email using git config commands.

The 'fatal: A branch named already exists' error occurs when you try to create a branch with a name that already exists in your local repository. Switch to the existing branch, use a different name, or reset the branch to a new starting point.

Git has detected that symbolic references form a loop, where ref A points to ref B, which eventually points back to ref A. This prevents Git from resolving the final target commit.

The 'gpg failed to sign the data' error with 'No secret key' occurs when Git tries to sign a commit but GPG cannot find the private key configured in your Git settings. This typically happens when your signing key ID is misconfigured, the key was never imported, or GPG is looking in the wrong keyring.

This Git error occurs when you try to push commits but the remote branch has new commits you don't have locally. Fix it by pulling remote changes first with 'git pull' or 'git pull --rebase', then push again. Force pushing should only be used when you intentionally want to overwrite remote history.

This error occurs when Git cannot find the specified commit reference, usually because the repository has fewer commits than requested or you're working with a shallow clone that lacks sufficient history.

The 'ssh: connect to host github.com port 22: No route to host' error means your system cannot find a network path to reach GitHub's SSH server. This typically indicates a network-level issue such as firewall blocking, incorrect routing, or the SSH port being filtered by your ISP or network administrator.

This error occurs when Git detects uncommitted changes in your working directory that conflict with incoming changes from a merge. You need to either commit, stash, or discard your local changes before Git can proceed with the merge.

This Git error occurs when you run `git reset` and there are untracked files in your working directory that would be overwritten or removed by files from the target commit. Git prevents the reset to protect your untracked work from being silently deleted.

The 'fatal: Not a valid object name' error occurs when Git cannot find the branch, tag, or commit you're referencing. This typically happens in freshly initialized repositories before the first commit, or when referencing a branch that doesn't exist yet.

This Git error occurs when a merge operation was started but not completed. The MERGE_HEAD file still exists in your .git directory, indicating Git is waiting for you to either finish the merge by committing or abort it entirely.

This error occurs during a Git merge or rebase when a file was renamed in one branch but deleted in another. Git cannot automatically resolve this conflict because it involves a structural change to the file tree, not just content differences. You must manually decide whether to keep the renamed file or accept the deletion.

This error occurs when you run `git pull` or `git push` on a local branch that isn't connected to a remote branch. Git doesn't know which remote branch to sync with. You can fix it by setting up tracking with `git branch --set-upstream-to` or by specifying the remote and branch explicitly.

The 'RPC failed; curl 92' error occurs when Git's HTTP/2 connection to a remote server is unexpectedly closed. This typically happens due to HTTP/2 protocol issues, slow networks, or proxy/firewall interference.

This Git error occurs when trying to set an upstream branch that your local repository doesn't know about. The fix is usually to run 'git fetch' first to update your local knowledge of remote branches, or use 'git push -u' to create and track the branch in one step.

This error occurs when Git cannot find a valid working tree at the specified path. The fix usually involves navigating to the correct directory, fixing worktree configuration, or cleaning up stale worktree references.

This Git error occurs when you try to switch branches, but untracked files in your working directory would be overwritten by files from the target branch. Git prevents the checkout to avoid accidental data loss.

This error occurs when Git detects a lock file indicating another Git process is running. Usually caused by an interrupted Git operation that left a stale .git/index.lock file behind. The fix is to safely remove the lock file after confirming no Git process is actually running.

The detached HEAD state occurs when HEAD points directly to a commit instead of a branch. This is not an error but a warning that any new commits you make will not belong to any branch and could be lost when you switch branches.

This Git warning occurs when a reference name (like 'feature') matches multiple refs such as a branch and a tag with the same name. Git cannot determine which one you mean, so you need to use the full refname or remove the duplicate reference.

This warning appears when you try to delete a branch with `git branch -d` that contains commits not yet merged into your current branch or its upstream. Git is protecting you from accidentally losing work. You can either merge the branch first, verify the commits exist elsewhere, or force delete with `git branch -D`.

This Git status message indicates your working directory has no changes to commit. While not an error, it often confuses developers who expect to see modified files. The message means all tracked files match your last commit and there are no staged changes waiting to be committed.

This error occurs when you try to remove a file with git rm that has uncommitted changes. Git blocks the removal to prevent accidental data loss. Use --cached to keep the file or -f to force removal.

The 'credential-manager is not a git command' error occurs when Git cannot find the credential helper executable. This typically happens when Git Credential Manager is not installed, has been renamed, or the configuration points to an outdated helper name.

The 'terminal prompts disabled' error occurs when Git needs to prompt for credentials but runs in a non-interactive environment. This commonly happens in CI/CD pipelines, scripts, or automated processes where there's no terminal to receive user input.

This error occurs when you try to merge or push to a protected branch on GitHub, but one or more required CI/CD status checks have not passed. GitHub blocks the merge until all configured status checks report success.

GitHub blocks your push with GH007 when commits contain your private email address and email privacy protection is enabled. Configure Git to use GitHub's noreply email and rewrite the problematic commits to resolve this.

This error occurs when pushing to a GitHub protected branch that requires at least one approving review before changes can be merged. You must use a pull request workflow and get approval from reviewers with write access.

The 'Dependency review found vulnerabilities' error occurs when GitHub's dependency-review-action detects security vulnerabilities in new or updated dependencies introduced by a pull request. This CI check blocks merging until the vulnerabilities are resolved or explicitly allowed.

This error occurs when pushing to a GitHub organization repository that has OAuth App access restrictions enabled. The OAuth application you're using (such as Git Credential Manager or an IDE) hasn't been approved by your organization administrator to access organization resources.

This error occurs when GitLab push rules reject your commit because the commit message doesn't match the required regex pattern. You need to amend your commit message to include required elements like issue numbers, ticket references, or specific formats.

This GitLab error occurs when your account or group has two-factor authentication (2FA) enforced, and you attempt to authenticate Git operations using your password instead of a Personal Access Token or SSH key. After enabling 2FA, password authentication is no longer accepted for Git over HTTPS.

This error occurs when your GitLab namespace (user or group) has exceeded its storage quota. Git push operations are blocked until you reduce storage usage or purchase additional capacity. Free tier namespaces have a 10 GiB limit.

This error occurs when Git cannot delete or replace a file during operations like checkout, pull, or merge because the file is locked by another process. On Windows, this commonly happens when an IDE, editor, antivirus, or another program has the file open. The fix involves identifying and closing the process holding the file lock.

This Git error occurs on Windows when checking out a repository that contains symbolic links, but your user account lacks the privilege to create symlinks. Windows requires either administrator rights or Developer Mode enabled to create symbolic links.

This GPG error appears when verifying a signed Git commit or tag and the signature does not match the content. This indicates the signed content was modified after signing or there is a key mismatch issue.

This error occurs when Git Credential Manager (GCM) cannot retrieve stored credentials from Windows Credential Manager. Common causes include corrupted credential entries, misconfigured credential stores, or stale authentication tokens that need to be refreshed.

This error occurs when Git's safecrlf setting detects that committing a file would change its line endings from LF (Unix-style) to CRLF (Windows-style), potentially causing issues in cross-platform projects. The fix involves configuring Git's line ending settings appropriately for your project and platform.

The 'git-receive-pack: command not found' error occurs when the Git receive-pack binary cannot be found in the remote server's PATH during a push operation. This typically happens due to shell configuration differences between interactive and non-interactive SSH sessions.

This error occurs on Windows when Git cannot access files because antivirus software is actively scanning or quarantining them. The fix involves configuring your antivirus to exclude the Git repository folder or temporarily disabling real-time protection during Git operations.

This error occurs when Git running in WSL (Windows Subsystem for Linux) cannot write to a config file due to Windows/Linux filesystem interoperability issues. The fix involves using Linux-native paths, configuring WSL mount options, or ensuring proper file permissions between the two systems.

This error occurs when Git on macOS cannot find the Xcode Command Line Tools needed for certain operations. The xcodebuild utility is part of Apple's developer toolchain, and Git requires it for some advanced features. Installing or reinstalling the Command Line Tools resolves the issue.

Git fails to create AppleDouble files (prefixed with '._') that macOS uses to store extended attributes and resource forks. This typically happens when checking out files from a repository that was created on macOS and contains these metadata files. The fix involves configuring Git to ignore these files or cleaning the repository.

This error occurs when Linux runs out of inotify file watchers. Development tools like VS Code, webpack, and Git use inotify to monitor file changes in real-time. The default limit is often too low for large projects. The fix is to increase the inotify watches limit in your system configuration.

This error occurs when Git tries to access files that have been offloaded to iCloud by macOS's 'Optimize Mac Storage' feature. The files exist as placeholder stubs locally, and Git cannot read their actual contents, causing operations like status, diff, or commit to fail.

This error occurs when Git installed via snap cannot access your working directory due to snap's strict sandboxing. Snap packages have limited filesystem access by default, and certain directories require explicit permission grants or alternative installation methods.

The 'fatal: git fetch-pack: expected shallow list' error occurs when Git's shallow clone protocol encounters an unexpected response during fetch operations. This typically happens in CI/CD pipelines where shallow clones lack required commit history for operations like merges, rebases, or version detection.

This error occurs when Git commands attempt to determine the current branch name but the repository is in a detached HEAD state. This commonly happens in CI/CD pipelines where Git checkouts default to specific commits rather than branch references. The fix involves explicitly checking out a branch or using Git commands that handle detached HEAD gracefully.

This error occurs when your CI environment's Git version is too old to support the sparse-checkout command. The git sparse-checkout subcommand requires Git 2.25 or newer. Upgrade Git in your CI environment or use the legacy sparse-checkout configuration method.

This error occurs when a GitHub Actions workflow uses an action that requires a 'token' input but none was provided. The fix typically involves explicitly passing the GITHUB_TOKEN secret or ensuring your workflow has the correct permissions configured.

The 'fatal: unable to access: error setting certificate verify locations' error occurs when Git cannot find or access SSL/TLS certificate authority (CA) files during HTTPS operations. This commonly affects CI/CD pipelines, Docker containers, and minimal Linux distributions where certificate bundles are missing or incorrectly configured.

This Git error occurs when attempting to create a signed commit or tag using a GPG key that has been revoked. The revoked key is no longer valid for signing operations. You need to either generate a new key or use a different existing key for Git commit signing.

This error appears when running ssh-add -l and indicates that no SSH keys are loaded in the SSH agent. You need to either generate new SSH keys or add existing keys to the agent using ssh-add.

This error occurs when your system cannot resolve the hostname (like github.com) to an IP address during an SSH connection. The issue is typically caused by DNS misconfiguration, network connectivity problems, or firewall restrictions blocking DNS queries.

This SSH error occurs when your private key file has permissions that allow other users to read it. SSH refuses to use the key for security reasons. The fix is to restrict the file permissions to owner-only access using chmod 600 or chmod 400.

This Git error occurs when a submodule is registered in the Git index but lacks a corresponding URL entry in the .gitmodules file. The path exists as a gitlink (special directory entry) but Git cannot locate the remote repository to fetch its contents. Fix it by either adding the missing submodule configuration or removing the stale gitlink entry.

This error occurs when adding a Git submodule that conflicts with a cached submodule directory in .git/modules/. Fix it by removing the stale cache, using --force, or providing an alternate --name.

This Git config error occurs when you try to set a configuration key that already has multiple values. Use --replace-all to overwrite all values, or manually remove duplicates from your config file.

This error occurs when a Git configuration key is missing its required section prefix. Git config keys must follow the section.key format (e.g., user.name), and this error indicates an invalid or malformed key.

This error occurs when Git Large File Storage (LFS) is not installed on your system. Git LFS is a separate extension that must be installed and initialized before you can use git lfs commands.

The 'unsafe repository' error occurs when Git detects that the repository is owned by a different user than the one running Git commands. This security feature was introduced in Git 2.35.2 to prevent CVE-2022-24765, which could allow malicious code execution.

This error occurs when a Git repository exceeds its Git LFS storage or bandwidth quota on GitHub. The fix involves purchasing additional data packs, removing LFS tracking, or waiting for the monthly bandwidth reset.

This error occurs when your GitHub account has exceeded its monthly Git LFS bandwidth quota. Free accounts get 1 GB of bandwidth per month, which resets monthly. You can wait for reset, purchase data packs, adjust budget settings, or migrate large files off LFS.

The 'fatal: bad object HEAD' error indicates your Git repository's HEAD reference is corrupted or points to a missing commit object. This typically results from filesystem corruption, interrupted operations, or cloud sync conflicts. Recovery usually involves fetching from remote or restoring HEAD from backup.

The 'unable to unpack header' error indicates corruption in a Git object file. This typically results from disk corruption, interrupted operations, or file system issues affecting the .git/objects directory.

This error occurs when you try to create a Git tag with a name that already exists locally or remotely. The fix involves deleting the existing tag or using force flags to overwrite it.

This error occurs when Git cannot resolve a revision specifier (branch name, tag, or commit hash) that you provided. The reference either doesn't exist, hasn't been fetched, or was typed incorrectly.

This Git error occurs when you try to checkout, delete, or reference a tag that doesn't exist in your repository. The tag may have never been pushed to the remote, was deleted, or hasn't been fetched yet. Fix it by fetching tags from the remote or verifying the tag name.

The 'is not a valid tag name' error occurs when Git rejects a tag name that violates its reference naming rules. Git tags must follow strict conventions that prohibit certain characters and patterns. Rename your tag using only allowed characters to resolve this error.

This error occurs when you try to push a tag that already exists on the remote repository. Git rejects the push to prevent accidentally overwriting an existing tag. Fix by either deleting the remote tag first, force pushing, or using a different tag name.

This error occurs when you attempt a cherry-pick while conflicts from a previous merge or cherry-pick remain unresolved. You must resolve or abort the pending operation before starting a new one.

This error occurs when you try to revert a merge commit without specifying which parent to use. Git requires the -m option to determine which branch's changes to undo.

This error occurs when Git cannot execute a hook script, typically due to a missing or invalid shebang line, Windows line endings (CRLF), or a corrupted hook file. Fixing the shebang or regenerating the hook resolves most cases.

This message appears when Git detects worktree administrative data pointing to directories that no longer exist. Learn how to prune stale worktrees or repair broken references.

This Git bundle error occurs when you try to unbundle or fetch from a bundle file that references commits your repository doesn't have. The bundle contains incremental changes that depend on base commits missing from your repo. Fix it by ensuring prerequisite commits exist before unbundling.

Git's credential helper failed to provide authentication credentials for a remote operation. This typically occurs when the configured credential helper cannot find stored credentials, is misconfigured, or when cached credentials have expired.

The 'RPC failed; HTTP 503 Service Unavailable' error occurs when Git cannot complete an operation because the remote server (GitHub, GitLab, Bitbucket, etc.) is temporarily unavailable or overloaded. This is typically a server-side issue that resolves itself, but there are steps you can take to work around it.

This error occurs when Git cannot create the target directory for a clone operation due to filesystem permissions. The fix typically involves cloning to a directory you own, adjusting permissions on the parent directory, or using sudo with proper ownership correction.

The 'Operation cancelled' error in Git typically occurs when GPG signing fails due to terminal issues, when the credential helper times out, or when a network operation is interrupted. The fix depends on whether the error stems from GPG configuration, authentication, or connectivity problems.

The 'GH009: Secrets detected' error occurs when GitHub's push protection feature detects credentials, API keys, or other sensitive data in your commits. This security feature blocks the push to prevent accidental exposure of secrets in your repository.

GitHub repository rulesets can block pushes containing files with restricted extensions like .exe. To resolve this, either remove the file from your commit, request a bypass from repository administrators, or update the repository rules if you have admin access.

This warning appears on GitHub pull requests when your feature branch is behind the base branch (usually main or master). You need to update your branch with the latest changes from the base branch before merging, either by merging or rebasing.

This error occurs when you try to push or merge changes to a protected branch that requires approval from designated code owners. The branch protection rules enforce that any pull request modifying code owned by specific individuals or teams must be approved by those code owners before merging.

This GitLab error occurs when a merge request is blocked because the CI/CD pipeline has failed, been canceled, or hasn't run. To resolve it, fix the failing pipeline jobs, re-run the pipeline, or adjust the project's merge settings if appropriate.

GitLab rejects pushes when files exceed the configured maximum file size limit. This can be a push rule set at the project, group, or instance level, or the 100 MiB limit enforced on GitLab.com Free tier. Remove the large file from your commit history using BFG or git filter-repo, then use Git LFS for ongoing large file management.

This GitLab error occurs when you attempt an action that requires Maintainer or Owner role, but your current permissions are insufficient. Common triggers include pushing to protected branches, managing project settings, or modifying CI/CD configurations.

This error occurs when Bitbucket's branch permissions or restrictions block your push attempt. The branch is typically protected to require pull requests, or your user account lacks write access to the target branch.

This error occurs when Git attempts to create a file with a path exceeding Windows' 260-character MAX_PATH limit. Fix it by enabling Git's core.longpaths setting and optionally enabling Windows long path support at the system level.

This error occurs on Windows when Git tries to create files with paths exceeding the 260-character limit. Windows historically restricts path lengths to 260 characters (MAX_PATH), but this can be resolved by enabling Git's core.longpaths setting and optionally enabling Windows long path support.

The 'credential-manager-core was not found' error occurs when Git's configuration references the deprecated credential helper name. Git Credential Manager was renamed from 'manager-core' to 'manager' in late 2022, and older configurations need to be updated.

This error occurs on macOS when the Xcode Command Line Tools are missing, corrupted, or their path is invalid. It commonly appears after a macOS update and prevents Git and other development tools from working. The fix is straightforward: reinstall or reset the Command Line Tools.

This error occurs when Git cannot locate the osxkeychain credential helper on macOS. It typically happens when using Git GUI applications with bundled Git versions that cannot find the system credential helper, or when the credential helper is misconfigured.

This warning occurs when Git tries to remove a directory during operations like checkout, pull, or submodule updates, but .DS_Store or other macOS-generated files prevent deletion. The operation typically succeeds despite the warning.

This error occurs when Git cannot write object files because your user account has exceeded its disk quota. The fix involves either freeing up space within your quota, requesting a quota increase from your system administrator, or cleaning up Git-specific storage like old objects and large files.

This error occurs when using Git within a Flatpak application (such as VS Code, GitKraken, or other IDEs) that is restricted by Flatpak's sandbox security model. The fix involves granting the application filesystem permissions to access your project directories using flatpak override, Flatseal, or running with explicit permissions.

The 'fatal: Couldn't find remote ref refs/heads/branch-name' error occurs when Git cannot locate the specified branch on the remote repository. This typically happens when a branch has been deleted, renamed, or never existed on the remote, often surfacing in CI/CD pipelines attempting to checkout stale branch references.

This error occurs when CircleCI cannot authenticate to your Git repository because the SSH checkout key has been deleted, revoked, or is misconfigured. The fix involves regenerating or adding a new deploy key in both CircleCI and your Git hosting provider.

This message appears when Git's rerere (reuse recorded resolution) feature has no saved conflict resolutions to apply. Either rerere is not enabled, the cache is empty, or the specific conflict hasn't been resolved before.

Git warns that your commit message contains characters not encoded in UTF-8. Fix this by setting the i18n.commitEncoding config or by converting your message to UTF-8 encoding before committing.

This error occurs when Git tries to sign a commit using an SSH key that doesn't exist at the configured path. The fix involves verifying the key file path in your Git configuration and ensuring the SSH signing key actually exists.

This error occurs when GPG creates a new keybox file but cannot use it, typically due to the keyboxd daemon configuration in newer GPG versions (2.4.1+), corrupted GPG home directory, or permission issues. The fix involves either disabling keyboxd mode or reinitializing the GPG directory.

This error occurs when Git tries to connect through a proxy server that doesn't exist or can't be reached. The fix typically involves removing outdated proxy settings from Git config or environment variables, or correcting the proxy address if you're actually behind a proxy.

The 'Server does not support partial clone' error occurs when you try to use Git's partial clone feature (--filter option) against a remote server that hasn't enabled this capability. This is a server-side limitation, not a client issue.

This error occurs when Git cannot find the git-upload-pack executable on the remote server during clone, fetch, or pull operations. It typically indicates a PATH configuration issue with non-interactive SSH sessions.

Git's rerere (reuse recorded resolution) feature failed to automatically apply a previously recorded conflict resolution. You need to manually resolve the conflict and let rerere learn the new resolution.

This Git warning appears when a filename contains characters that are not valid UTF-8 encoding. It commonly occurs with files created on systems using different character encodings (like Latin-1 or Windows code pages) and can cause cross-platform issues.

This warning appears when Git encounters an index file in an older format and automatically upgrades it to a newer version. It is generally harmless and indicates Git is ensuring compatibility with modern features.

The 'unable to read alternates file' error occurs when Git cannot access an alternate object database that was previously linked. This typically happens when a reference repository was deleted, moved, or when paths become invalid after moving the repository.

This error occurs when trying to push, pull, or fetch from a Git hosting server (GitHub, GitLab, Bitbucket, etc.) that is temporarily in maintenance mode for upgrades, backups, or system updates.

This error occurs when using git push --force-with-lease and your local tracking branch has outdated information about the remote. The fix usually involves running git fetch --prune to sync your local refs with the actual remote state.

This error occurs when Git cannot cleanly apply stashed changes because files in your working directory have been modified since you created the stash. You need to either commit, stash, or discard your current changes before applying the original stash.

Git warns about excessive loose objects when your repository has accumulated too many unpacked object files, typically over 6,700. This triggers automatic garbage collection to optimize storage and performance.

Git cannot find or launch the configured merge tool when attempting to resolve conflicts. This occurs when the tool is not installed, not in PATH, or not properly configured in .gitconfig.

Git ignores negation patterns (!) when parent directories are excluded. This occurs because Git never descends into ignored directories for performance reasons, making nested file patterns ineffective.

This error occurs when Git detects an unfinished cherry-pick operation. You must complete, skip, or abort the in-progress cherry-pick before starting a new one or performing certain other Git operations.

This error occurs when a Git hosting server (GitHub, GitLab, Bitbucket) encounters an unexpected internal problem while processing your push, pull, or clone request. The issue is server-side and typically resolves itself.

This error occurs when git rev-parse or other Git commands are executed outside of an initialized Git repository. Git cannot locate the .git directory in the current path or any parent directories.

Git push failed because the data being sent exceeds the server's maximum allowed request size. This typically happens when pushing large files, many commits at once, or repositories with substantial history over HTTP/HTTPS.

This warning appears when Git's reflog has fewer entries than expected, typically due to reflog expiration, a freshly cloned repository, or using time-based references beyond the available history.

This warning appears when you try to add a file larger than 50MB to Git. Large files bloat repository size and slow down operations. Use Git LFS or .gitignore to handle large files properly.

The 'can not move directory into itself' error occurs when using git mv with wildcards that include the destination directory. Use the -k flag to skip problematic moves, or exclude the destination from the pattern.

This Git error occurs when you try to use `git reset --hard` with a specific file path. Git's design intentionally prevents hard resets on individual files. Use `git checkout HEAD -- <path>` or `git restore` (Git 2.23+) to achieve the same effect of discarding local changes for specific files.

The "git fetch --unshallow" command fails when converting a shallow clone to a full repository. This typically occurs due to repository corruption, attempting to unshallow an already-complete repository, or CI/CD pipeline configuration issues.

This error occurs in CI/CD pipelines when Git attempts to update submodules in a shallow clone. Shallow clones (using --depth) lack the full commit history that submodules need to resolve their target commits, causing the update to fail.

This Git error occurs when you attempt to merge or pull with signature verification enabled, but one or more commits lack a GPG signature. Fix it by signing the commits or disabling signature verification for the operation.

This status appears in 'git status' when a submodule's working directory contains uncommitted changes or has checked out a different commit than what the parent repository expects. The fix involves either updating, committing, or resetting the submodule.

This error occurs when Git cannot establish an HTTPS connection because the SSL/TLS certificate presented by the remote server has expired. This commonly happens when root CA certificates expire, system CA certificates are outdated, or when the system clock is incorrect.

This error occurs when Git's connection to a remote server is terminated before the operation completes. The most common cause is pushing or cloning large repositories over HTTP, where the default buffer size is insufficient. Increasing the http.postBuffer setting or using SSH typically resolves the issue.

Git merge conflicts occur when competing changes are made to the same lines of a file across different branches. To resolve this, you must manually edit the conflicted files to choose the correct changes, then stage and commit the result.

The 'unable to connect to cache daemon' error occurs when Git cannot communicate with the credential cache daemon, typically due to socket permission issues, missing directories, or running Git as a different user than expected.

The 'fatal: protocol error: bad pack header' error occurs when Git fails to properly receive or interpret packfile data during network operations like clone, fetch, or pull. This is typically caused by memory constraints on the server or corrupted repository data.

This error occurs when multiple Git operations attempt to modify the shallow file simultaneously, typically in CI/CD environments with concurrent jobs. The fix involves isolating build directories or removing stale lock files.

This error occurs when you try to perform an operation on a remote named 'upstream' that doesn't exist in your Git repository. You need to add the upstream remote before using it, typically when working with a forked repository.

This Git error occurs when trying to merge a branch that Git cannot find or recognize. The fix usually involves fetching the remote branch first, checking for typos in the branch name, or using the correct remote prefix.

This error occurs when you try to interact with a remote repository named 'origin' that hasn't been configured in your local Git setup. It typically happens with newly initialized repositories or when the remote configuration has been removed or corrupted. The fix is straightforward: add the missing remote using `git remote add`.

This error occurs when files listed in .gitignore continue to appear in git status because they were already tracked before being added to .gitignore. Git only ignores untracked files, so previously committed files remain tracked even after adding them to .gitignore.

The 'We are not bisecting' error appears when you run a git bisect command like 'git bisect good' or 'git bisect reset' without an active bisect session. This typically occurs when bisect was never started, already ended, or its state files were corrupted.

Git rerere (reuse recorded resolution) failed to automatically apply a previously recorded conflict resolution. This happens when the cached resolution no longer matches the current conflict context.

Git maintenance gc task failed when attempting to clean up and optimize your repository. This usually occurs due to file locks, permission issues, or corrupted objects preventing garbage collection from completing.

This error occurs when Git cannot find a remote repository named 'origin'. The remote may not be configured, the URL may be incorrect, or there may be SSH/network connectivity issues preventing access to the remote repository.

This error occurs when Git's pre-rebase hook script exits with a non-zero status code, preventing the rebase operation from proceeding. The hook is intentionally blocking the rebase, often to protect published branches or enforce repository policies.

The 'NTLM authentication failed' error occurs when Git cannot authenticate through a corporate proxy server using NTLM (NT LAN Manager) credentials. This typically happens in enterprise environments where proxy servers require Windows domain authentication.

This warning appears when Git detects line ending inconsistencies between your file and the repository's configured line ending style. It indicates Git will normalize line endings during commit or checkout based on your core.autocrlf setting.

This error occurs when you accidentally use a remote-tracking branch reference like 'origin/main' where Git expects a simple remote name like 'origin'. The slash in 'origin/main' confuses Git because remote names cannot contain forward slashes in this context. The fix involves understanding the difference between remote names and branch references.

Git displays filenames with special characters as octal escape sequences like \303\251 instead of proper Unicode. This occurs when core.quotepath is enabled (default behavior).

The 'wrong type for object' error occurs when Git encounters an object with a mismatched type in its object database. This typically indicates repository corruption where a blob, tree, commit, or tag object doesn't match its expected type. Recovery involves fetching missing objects from remote or restoring from backups.

This error occurs when you try to push commits, create issues, or make any changes to a GitHub repository that has been archived by its owner. Archived repositories are read-only and cannot accept any modifications.

The 'ssh: connect to host github.com port 22: Connection timed out' error occurs when your SSH client cannot establish a connection to GitHub's SSH server. This is commonly caused by firewalls or proxies blocking port 22, and can be resolved by using SSH over port 443 or switching to HTTPS.

This error occurs when Git's commit-msg hook rejects your commit message. The hook validates message format (like conventional commits) and exits non-zero when validation fails. Fix by formatting your message correctly or bypassing the hook.

The GH006 error occurs when GitHub's branch protection or repository rulesets require a specific workflow to pass before merging, but the workflow either failed, was skipped, or never ran. This commonly happens with CI/CD pipelines when pushing to protected branches or merging pull requests.

This Git error occurs when you try to rebase while having staged changes in your index that haven't been committed. Git prevents the rebase to protect your staged work from being lost. The solution is to commit your staged changes, stash them, or use the --autostash flag.

This error occurs when you try to run a Git command that references a remote called 'origin', but no remote with that name is configured in your repository. The fix is to add the remote using `git remote add origin <url>` or verify your remote configuration.

This error occurs when Git cannot authenticate your SSH connection to a remote repository like GitHub, GitLab, or Bitbucket. The fix involves generating an SSH key, adding it to your SSH agent, and registering the public key with your Git hosting provider.

The git describe --broken command reports a broken worktree when Git cannot determine if local modifications exist due to repository corruption, broken submodules, or index issues.

This error occurs when Git encounters a file path that exceeds the operating system's maximum path length limit. On Windows, this is typically 260 characters (MAX_PATH). The fix involves enabling Git's long path support and configuring Windows to handle extended paths.

This DNS resolution error occurs when Git cannot translate a hostname like github.com into an IP address. The issue is typically caused by network connectivity problems, misconfigured DNS settings, proxy interference, or firewall blocks on DNS traffic.

This error occurs when the remote branch has commits that your local branch doesn't have. Git refuses the push to prevent overwriting those commits. The solution is to fetch and integrate the remote changes before pushing.

This error occurs when you try to view or manipulate a Git note for a commit that has no note attached, or when the note is stored in a different notes ref than expected. The fix involves specifying the correct notes reference or creating a note first.

This error occurs when your local branch is behind the remote branch. Git prevents the push because someone else has pushed commits that you don't have locally. You need to fetch and integrate those changes before pushing.

This error occurs when you try to push a local branch that has no tracking relationship with a remote branch. Git doesn't know where to push your changes because no upstream branch has been configured. The fix is to either set the upstream with the -u flag or configure Git to do it automatically.

This Git error occurs when you try to checkout a branch that doesn't exist locally or hasn't been fetched from the remote repository. The error indicates Git cannot find any branch, file, or reference matching what you specified. Fix it by fetching remote branches first or verifying the branch name.

The 'Permission to repo.git denied to username' error occurs when Git attempts to push to a remote repository using credentials for a different account that doesn't have access. This typically happens due to cached credentials, multiple GitHub accounts, or misconfigured SSH keys.

This error occurs when you try to switch branches while having uncommitted changes in files that differ between the current branch and the target branch. Git prevents the switch to avoid losing your work. You can resolve this by stashing, committing, or discarding your changes.

GitHub rejects pushes containing files larger than 100 MB. To fix this, you must remove the large file from your repository history using BFG Repo-Cleaner or git filter-repo, then either exclude the file or use Git LFS (Large File Storage) for tracking large files.

The 'pre-receive hook declined' error occurs when a server-side Git hook rejects your push. This is typically caused by protected branch restrictions, insufficient permissions, commit message format violations, or push rule violations on platforms like GitHub and GitLab.

The GH007 error occurs when GitHub's email privacy settings block a push because your commits contain your private email address. Fix it by configuring Git to use GitHub's noreply email address, then amend the offending commits.

A dangling blob message from git fsck indicates file content that was staged but never committed. This is typically harmless and will be automatically cleaned up by Git's garbage collection.

This error occurs when Git tries to use Git LFS (Large File Storage) but the git-lfs command is not installed or not in your PATH. Install Git LFS and run 'git lfs install' to resolve it.

The 'HEAD is now at' message is not an error - it's an informational message from Git confirming that HEAD has been moved to a specific commit. This typically appears after checkout, reset, rebase, or detaching HEAD operations.

This error occurs when Git cannot perform a fast-forward merge during a pull operation because your local branch and the remote branch have diverged. You have local commits that are not on the remote, and the remote has commits you don't have locally.

This message appears when you try to merge or pull a branch that has no new commits relative to your current branch. While not technically an error, it often confuses developers when they expect changes but Git reports nothing to merge. Understanding merge direction and fetching remote changes resolves most cases.

The 'request was too large' error occurs when Git attempts to transfer more data than the server or network can handle in a single HTTP request. This commonly happens when pushing large repositories, many commits, or files that exceed buffer limits.

This GitLab CI/CD error occurs when one or more jobs in your pipeline fail. The failure can be caused by test failures, script errors, configuration issues, or external dependencies. To fix it, examine the job logs, identify the root cause, and resolve the underlying issue.

This Git merge conflict occurs when a file was deleted in one branch but modified in your current branch (HEAD). Git cannot automatically decide whether to keep your changes or accept the deletion, requiring manual resolution.

This error occurs when Git detects an incomplete rebase operation. You either need to finish, abort, or skip the existing rebase, or manually remove the leftover .git/rebase-merge directory if no rebase is actually in progress.

This error occurs when Git detects an incomplete merge operation in your repository. A previous merge was started but never finished - either due to unresolved conflicts or a forgotten commit. Fix by completing the merge with a commit, aborting the merge, or manually removing the MERGE_HEAD file.

This error occurs during a Git rebase when Git encounters a merge conflict it cannot automatically resolve. The rebase is paused, not failed, and you can either fix the conflict, skip the problematic commit, or abort the rebase entirely.

This error occurs when you try to create or checkout a Git branch with a name that violates Git's reference naming rules. Common causes include starting the name with a hyphen, using reserved names like HEAD, or including forbidden characters. The fix is to rename the branch using valid characters and following Git's naming conventions.

This error occurs when Git cannot write to the .git/objects directory due to file ownership or permission issues. The most common cause is running Git commands with sudo or as a different user, which creates objects owned by root that your regular user cannot modify.

This message appears during a Git rebase operation, indicating Git is temporarily moving your branch pointer back to the common ancestor before replaying your commits on top of the target branch. It is an informational message, not an error.

The 'Nothing to do' message appears when Git's interactive rebase has no commits to process. This typically occurs when the rebase todo list is empty, either because all lines were deleted, you're rebasing HEAD onto itself, or there are no commits between the specified range.

This error occurs when Git cannot determine your identity (name) for commits. Git requires both a user name and email to be configured before you can create commits. The fix involves setting your Git user.name configuration, either globally or for the specific repository.

This informational message appears when Git automatically runs garbage collection to optimize repository performance. It runs in the background and is normal behavior, but if it appears frequently, it may indicate the need for manual maintenance.

The 'Aborting commit due to empty commit message' error occurs when Git's text editor closes without saving a commit message, or when the message file is empty. This typically happens when the configured editor doesn't wait for user input or exits prematurely.

Git reports 'fatal: bad object' when it cannot find or read a referenced object in the repository database. This typically occurs during git gc, status, or other operations when a commit, tree, or blob is missing or corrupted due to incomplete operations, shallow clones, or filesystem issues.

This Git error occurs when you try to switch branches while having uncommitted changes that conflict with files in the target branch. Git prevents the checkout to protect your work. You can resolve it by stashing, committing, or discarding your changes.

The 'fatal: invalid reference' error occurs when Git cannot find the branch, tag, or commit you specified. This typically happens due to typos, case sensitivity issues, or when the remote branch hasn't been fetched yet.

This error occurs when Git cannot resolve a reference (branch name, tag, or commit) to a valid commit object. It typically happens when a branch name conflicts with another Git reference like a tag pointing to a non-commit object, or when trying to checkout a reference that doesn't exist. The fix involves using fully qualified reference paths or resolving the naming conflict.

This Git error occurs when you use `git checkout --ours` or `git checkout --theirs` without being in a merge conflict state or without specifying file paths. These options only work during active merge conflicts and require a pathspec to indicate which files to check out.

This error occurs when you try to delete a Git branch that is currently checked out in your working directory or in a linked worktree. Git prevents this to avoid leaving your repository in an undefined state. The solution is to switch to a different branch first, or remove the associated worktree if using multiple working directories.

This Git warning appears when a pre-commit hook file exists but lacks executable permissions. Git detects the hook but cannot run it. The fix is to make the hook file executable with chmod.

This Git error occurs when you try to clone, verify, or unbundle a file that Git doesn't recognize as a valid bundle format. The file may be corrupted, not actually a Git bundle, or created with an incompatible Git version. Verify the file format and recreate the bundle if needed.

This error occurs when you run `git commit --amend` in a repository with no existing commits. You cannot amend something that does not exist. The solution is to create an initial commit first using `git commit` before attempting to amend.

This message appears when you run git commit but haven't staged any changes first. Git requires you to explicitly add files to the staging area before committing, or use the -a flag to auto-stage modified tracked files.

This error occurs when Git tries to execute a commit-msg hook that doesn't exist or has an invalid configuration. The hook file may be missing, have incorrect permissions, contain an invalid shebang line, or reference a non-existent interpreter. The fix involves verifying the hook file exists and is properly configured.

This Azure DevOps error occurs when you try to push directly to a branch that has branch policies enabled. The branch requires changes to go through pull requests rather than direct commits.

The 'refs/heads/main exists; cannot create' error occurs when unbundling a Git bundle file into a repository that already has a reference with the same name. Use git fetch from the bundle instead, or delete the conflicting ref first.

This error occurs when a Git branch reference file becomes corrupted, typically due to a system crash, power failure, or disk error. The fix involves deleting the corrupted ref file and recovering from the reflog or remote.

The 'fatal: invalid object name' error occurs when Git cannot find a referenced commit, branch, or object in the repository. This typically happens with empty repos, typos in references, or corrupted Git objects.

This error occurs when pushing data to a Git server that exceeds the server's configured maximum pack size limit. Common with large repositories, big binary files, or when pushing many commits at once.

This error occurs when git worktree add cannot find the branch or commit reference you specified. Common causes include the branch not existing locally, shallow clones, or typos in the branch name.

This Git warning appears when running sparse-checkout commands on a repository that hasn't been initialized for sparse checkout. Enable sparse checkout with 'git sparse-checkout init' or disable the feature to resolve it.

The 'fatal: unable to negotiate: protocol error' occurs when Git's SSH connection fails because the client and server cannot agree on cryptographic algorithms. This typically happens when connecting to older servers that only support deprecated SSH algorithms like ssh-rsa or diffie-hellman-group1-sha1.

This error occurs when Git is not installed on your system or is not available in your PATH environment variable. The solution involves installing Git or configuring your shell to find the Git executable.

This Git error occurs when you try to run a command that Git doesn't recognize. It usually means you've misspelled a command, forgot to install a Git extension, or are trying to use a command that doesn't exist. The fix involves checking spelling, installing missing extensions, or using the correct command name.

This fatal error occurs when you try to run a Git command that requires a working directory inside a bare repository. Bare repositories store Git data without a working tree, so commands like checkout, status, or merge cannot work there.

The 'API rate limit exceeded' error occurs when you've made too many requests to the GitHub API within a given time period. Unauthenticated requests are limited to 60 per hour, while authenticated requests get 5,000 per hour. The fix is to authenticate your requests or implement rate limit handling.

The 'Repository is read-only' error in Bitbucket occurs when you try to push changes but lack write permissions. This is typically caused by insufficient access rights, repository archival, account suspension, or hitting storage quotas.

This error occurs when Git cannot set up automated maintenance tasks with your system scheduler. Git maintenance uses platform-specific schedulers (systemd, cron, launchctl, or schtasks) to run repository optimization tasks, and this fails when the scheduler is unavailable or lacks permissions.

This error occurs when pushing to a GitHub branch that requires signed commits, but your commits are unsigned. You must configure GPG or SSH commit signing and re-sign your commits before pushing.

The 'GH006: Protected branch update failed - administrators cannot bypass' error occurs when GitHub branch protection rules are configured to enforce restrictions on all users, including repository administrators. This setting prevents even admins from pushing directly to protected branches.

The 'GH006: Protected branch update failed - must use a merge queue' error occurs when you try to push or merge directly to a protected branch that has merge queue enforcement enabled. You must add your pull request to the merge queue instead of merging directly.

This error occurs when you attempt to merge a GitHub pull request that is still marked as a draft. Draft pull requests are intentionally blocked from merging to indicate work-in-progress. You must mark the PR as 'Ready for review' before it can be merged.

This GitHub error appears when you try to merge a pull request but the source and target branches have conflicting changes. You must resolve the conflicts either through the GitHub web interface or by pulling the branches locally, fixing conflicts manually, and pushing the resolved code.

This error occurs when you attempt to force push to a branch that GitLab has marked as protected. Protected branches prevent history rewriting to maintain code integrity and require specific permissions or configuration changes to allow force pushes.

This error occurs when GitHub's rate limiting system detects patterns that appear to be automated or excessive API usage. The fix involves waiting for the cooldown period, implementing request throttling, and following GitHub's best practices for API usage.

This GitLab CI error occurs when a job in your .gitlab-ci.yml file is not properly defined as a YAML mapping (hash). The job configuration must be a key-value structure, not a scalar value or list. Fix by ensuring each job has properly indented configuration options.

This error occurs when you try to push commits to a GitLab repository that has been archived. Archived projects are read-only, so you must unarchive the project or push to a different repository.

The 'deploy token has expired' error occurs when GitLab rejects authentication because the deploy token used for Git operations over HTTPS has passed its expiration date. You need to create a new deploy token with appropriate scopes and update your credentials.

This error occurs when Bitbucket's branch protection rules block your push attempt. The repository has restrictions configured that require either specific user permissions, pull requests, or signed commits before changes can be pushed to the protected branch.

This error occurs when Bitbucket's merge checks require a certain number of reviewer approvals before a pull request can be merged. You need to get the required approvals from team members or contact an admin to adjust the branch restrictions.

The 'App password required. Your account has 2FA enabled' error occurs when pushing to Bitbucket with two-factor authentication enabled. Bitbucket requires an App Password instead of your regular account password for Git operations when 2FA is active.

This error occurs in Azure DevOps when a build validation policy on a protected branch fails, preventing a push or pull request merge. The fix typically involves ensuring the build pipeline passes, correcting branch policy configuration, or using pull requests instead of direct pushes.

The TF401019 error occurs when your Azure DevOps Personal Access Token (PAT) has expired. This blocks Git operations like push, pull, and clone. The fix involves generating a new PAT in Azure DevOps and updating your stored credentials.

This warning occurs when Git tries to create a symbolic link on Windows but lacks the required permissions. By default, Windows restricts symlink creation to administrators. The fix involves either enabling Developer Mode, running Git with elevated privileges, or configuring Git to handle symlinks differently.

This Git warning appears on Windows when files have Unix-style line endings (LF) but Git is configured to convert them to Windows-style (CRLF). While not an error, this indicates a line ending configuration mismatch that can cause issues in cross-platform projects. Configure core.autocrlf appropriately or use .gitattributes for consistent handling.

The 'Proxy CONNECT aborted' error occurs when Git attempts to connect to a remote repository through a proxy server, but the proxy terminates the connection. This typically happens due to misconfigured proxy settings, authentication failures, or firewall restrictions blocking the tunnel. The fix usually involves correcting proxy configuration or bypassing the proxy entirely.

This error occurs when Git for Windows cannot communicate with Pageant, the PuTTY SSH authentication agent. The fix involves starting Pageant, loading your SSH keys, or switching to OpenSSH for authentication.

This macOS Gatekeeper error prevents Git from running because Apple cannot verify the developer's identity. The fix involves either approving the app in Security settings, removing the quarantine attribute, or reinstalling Git from a trusted source like Homebrew.

This Git error occurs when trying to rename a file where only the case differs (e.g., 'File.txt' to 'file.txt') on Windows or macOS. These operating systems use case-insensitive filesystems by default, which cannot distinguish between files that differ only in case.

This error occurs when SELinux (Security-Enhanced Linux) blocks Git from executing the git-remote-https helper binary. SELinux enforces mandatory access control policies that prevent unauthorized execution of binaries, even when standard Unix permissions would allow it. The fix involves adjusting SELinux contexts or policies.

This error occurs on macOS when Git tries to modify files that are locked by a Time Machine local snapshot. APFS snapshots create read-only copies of your filesystem, and Git cannot unlink or overwrite files protected by these snapshots. The solution involves deleting old local snapshots or waiting for Time Machine to release them.

This macOS error occurs when Git attempts to access files or directories in protected locations but lacks Full Disk Access permission. Starting with macOS Mojave (10.14), Apple introduced stricter privacy protections that require explicit user authorization for applications to access certain directories.

This Linux error occurs when AppArmor, a mandatory access control security system, blocks Git from performing operations such as cloning, pushing, or accessing files. AppArmor profiles restrict what resources applications can access, and a misconfigured or overly restrictive profile can prevent Git from functioning properly.

This error occurs when Git cannot create lock files on an NFS-mounted filesystem because NFS file locking is disabled, misconfigured, or the lock daemon is not running. The fix involves either enabling NFS locking, using a local filesystem for the repository, or configuring Git to work around the limitation.

When a firewall blocks SSH port 22, Git operations fail with a connection timeout. This is common in corporate networks and institutions. The fix is to use GitHub's SSH server on port 443 or switch to HTTPS authentication.

This error occurs when Git attempts to create a worktree in a CI/CD environment but the filesystem is mounted as read-only. The fix involves using a writable directory, configuring the CI workspace correctly, or adjusting container mount options.

This error occurs in GitHub Actions when the actions/checkout step fails to clone or access a repository. Exit code 128 indicates a fatal Git error, typically caused by authentication issues, missing repository permissions, or invalid references.

This error occurs when Git cannot acquire a lock on a reference file during a prune operation, commonly in CI/CD pipelines. It usually happens when stale references conflict with prune operations, or when concurrent jobs access the same repository. The fix involves cleaning up stale refs, using proper fetch flags, or adjusting CI configuration.

Git operations fail when file paths exceed system-imposed limits, typically the 260-character Windows MAX_PATH constraint. This affects deeply nested directories and is common with submodules or node_modules on Windows.

The 'git fetch --depth=50 origin +refs/pull/X/merge exited with 128' error occurs in CI/CD pipelines when Git cannot find the pull request merge reference. This typically happens when a PR is merged or closed before the build completes.

The 'gpg failed to sign the data' error with 'No pinentry' occurs when GPG cannot find or access the pinentry program needed to prompt for your passphrase. This typically happens after system updates, in SSH sessions, or when the GPG agent configuration is missing or incorrect.

The 'ssh: connect to host github.com port 22: Connection refused' error occurs when your SSH connection to GitHub is actively rejected. This typically happens when port 22 is blocked by a firewall, the SSH service is unavailable, or network issues prevent the connection. The most common fix is to use SSH over port 443.

This error occurs when the SSH client offers too many keys to the server before finding the correct one. The SSH server disconnects after reaching its MaxAuthTries limit (default 6). The fix is to configure SSH to use only the correct key for your Git host.

The 'remote: Invalid username or password. fatal: Authentication failed' error occurs when Git cannot authenticate with the remote repository. This typically happens because password authentication has been deprecated, you have two-factor authentication enabled, or your stored credentials are outdated.

This error occurs when Git cannot access a submodule's remote repository during clone, update, or init operations. Common causes include the repository being deleted, renamed, made private, or authentication issues preventing access. The fix involves verifying the repository exists, updating the submodule URL, or fixing authentication credentials.

This Git error occurs when trying to fetch a specific commit by its SHA hash, but the Git server is configured to only allow fetching advertised references like branches and tags. This commonly happens with submodules pointing to commits that don't exist on the remote or were removed during squash merges.

This error occurs when Git cannot locate or access the git directory for a submodule. The submodule's internal .git reference points to a path that doesn't exist or has become corrupted after moving, cloning, or branch switching.

This error occurs when Git cannot resolve a specific commit or branch in a submodule. It typically happens when the branch configured for the submodule no longer exists, or when shallow clone restrictions prevent fetching the required revision.

This Git LFS error occurs when files that should be tracked by LFS (per .gitattributes) were committed directly to the repository instead of as LFS pointer files. The fix involves re-adding files to LFS or using git lfs migrate.

This error indicates Git object file corruption, typically caused by interrupted operations, system crashes, or filesystem issues. The fix involves removing empty objects and recovering from a remote repository.

This error occurs when Git cannot access its configuration file due to missing files, incorrect permissions, or misconfigured environment variables. The fix depends on which config level is affected.

This error occurs when a Git configuration setting expects a boolean value (true/false) but receives an invalid value instead. Common causes include accidental equals signs, quoted values, or null entries from GUI clients.

This error occurs when Git encounters a malformed or corrupted configuration file. The config file has invalid syntax, missing sections, special characters, or invisible formatting issues that prevent Git from parsing it.

This Git security error occurs when the repository owner differs from the user running Git commands. Added in Git 2.35.2 to address CVE-2022-24765, it prevents arbitrary code execution via malicious Git hooks.

This error occurs when Git cannot acquire a lock on its config file, usually because a .lock file was left behind by a crashed Git process or another application is holding the file open.

This error occurs when Git prevents operations on a worktree because it has been explicitly locked. Unlock the worktree using 'git worktree unlock' or use --force flags for remove/move operations.

This error occurs when Git LFS cannot authenticate with the LFS server to download or upload large files. Common causes include missing or expired credentials, incorrect credential helper configuration, or repository permission issues. Fix by configuring credential caching or using SSH authentication.

The 'clean filter lfs failed' error occurs when Git LFS cannot process a file during staging. This typically indicates Git LFS is not properly installed, has permission issues, or the configuration is corrupted.

This error occurs when Git prevents checking out a branch that's already in use by another worktree. Learn how to prune stale worktrees, use the --force flag, or work with detached HEAD.

This Git LFS error occurs when an LFS pointer file exists in your repository, but the actual binary file was never uploaded to the LFS server. The fix usually involves having the original author push the missing objects or recovering them during repository migration.

This error occurs when you run a Git command that requires a working tree (like checkout, status, or add) in a bare repository or inside the .git directory. The fix depends on whether you need to clone the repo, exit the .git folder, or reconfigure a misconfigured repository.

The 'packfile cannot be accessed' error occurs when Git's pack files become corrupted or inaccessible. This typically results from disk failures, interrupted operations, or file system corruption and requires recovering or unpacking the damaged pack files.

This error indicates that a Git object file in your repository's .git/objects directory has become corrupted. Recovery typically involves removing the corrupt object and fetching it from a remote repository or backup.

This error occurs when Git cannot decompress repository object data due to corruption. The zlib checksum failed, indicating damaged objects from disk failure, network issues, or memory problems.

This error occurs when git blame cannot find the specified file in the HEAD commit. Common causes include case sensitivity mismatches, renamed files, files not yet committed, or symbolic links.

This error indicates repository corruption where a Git tree object references a blob (file) that is missing from the object database. Recovery involves restoring the missing object from another clone or regenerating it from the working directory.

This error occurs when Git cannot find the object (commit, branch, tag, or file) you referenced. The object name may be a typo, the repository may lack commits, or the reference simply does not exist.

This error occurs when Git operations conflict with OneDrive's file synchronization on Windows. OneDrive creates duplicate files or blocks access when Git rapidly updates files during operations like fetch, pull, or checkout. The solution involves either moving repositories outside OneDrive or configuring sync settings to prevent conflicts.

Git tag deletion errors occur when the tag doesn't exist, when a branch has the same name, or when server-side protections prevent deletion. Solutions depend on whether you're deleting local or remote tags.

This error occurs when Git cannot use GPG to cryptographically sign a tag. Common causes include missing GPG_TTY configuration, expired keys, or misconfigured pinentry programs.

This error occurs when cherry-picking a merge commit without specifying which parent to use as the base. Use the -m option to specify the parent number (typically -m 1 for the main branch).

The 'cherry-pick is now empty' error occurs when Git detects that the commit you're trying to cherry-pick would result in no changes. This happens when the changes already exist in your branch or when conflict resolution removed all modifications.

Cherry-pick conflicts occur when Git cannot automatically apply a commit's changes to your current branch. This happens when the same lines have been modified differently, requiring manual conflict resolution.

This error occurs when Git cannot find the commit you're trying to cherry-pick. The most common cause is that the commit exists on a remote branch that hasn't been fetched locally. Fetching from the remote usually resolves the issue.

This error occurs when Git cannot find the specified commit reference during a revert operation. Common causes include shallow clones with limited history, syntax errors in the revision specifier, or referencing commits that don't exist in your local repository.

This error occurs when you attempt to run git revert while there are unresolved merge conflicts in your working directory. Git requires all conflicts to be resolved before proceeding with new operations.

This error occurs when you specify an archive format that Git doesn't recognize or support. The fix involves using a valid format like tar, zip, or tar.gz, or checking your Git version for format availability.

This warning occurs when you try to add a file that matches a pattern in your .gitignore. You can force-add the file with `git add -f`, add an exception to .gitignore, or remove the ignore rule entirely.

This error occurs when Git cannot parse a patch file due to formatting issues such as missing trailing newlines, stripped whitespace on empty context lines, incorrect hunk line counts, or Windows line endings. Fixing the patch file structure resolves the issue.

Git fsck reports 'dangling commit' when it finds commits not reachable from any branch, tag, or reference. These are normal byproducts of Git operations like rebasing or amending commits and are not harmful.

Git hooks that exit with code 1 block the Git operation they're attached to. This typically occurs when pre-commit, pre-push, or other hooks detect issues like linting errors, failing tests, or script problems that prevent the operation from completing.

This informational message appears when running 'git init' in a directory that already contains a Git repository. It is harmless and does not overwrite any existing data, commits, or configuration.

This error occurs when Git cannot create a directory due to insufficient filesystem permissions. The fix involves checking directory ownership, adjusting permissions, or initializing the repository in a location where you have write access.

This error indicates Git repository corruption where a tree object references another tree or blob that no longer exists. Recovery involves fetching missing objects from remotes, restoring from backups, or reconstructing the missing objects.

This Git warning occurs when sparse-checkout patterns don't match the expected format for cone mode. Git rejects complex glob patterns like '**/*.js' when cone mode is enabled. Switch to non-cone mode or use directory-based patterns to resolve this.

The 'Sparse checkout leaves no file in the working directory' error occurs when Git's sparse-checkout patterns don't match any files in the repository. This is commonly caused by incorrect path specifications, file encoding issues on Windows, or attempting to checkout non-existent directories.

Git notes merge conflicts occur when the same note is modified in both local and remote refs. Resolve conflicts manually in .git/NOTES_MERGE_WORKTREE, then finalize with git notes merge --commit.

The 'RPC failed; HTTP 502 Bad Gateway' error occurs during Git push, pull, or clone operations when a proxy server or load balancer cannot communicate with the upstream Git server. This is typically a server-side issue but can sometimes be resolved by adjusting Git configuration or using SSH instead of HTTPS.

This warning appears when you try to perform operations on a file that has unresolved merge conflicts. Git is telling you the file is in a conflicted state and requires manual resolution before you can checkout, add, or otherwise manipulate it normally.

This error occurs when you've exceeded GitHub's API rate limits, typically during unauthenticated requests. The fix is to authenticate with GitHub using a personal access token or SSH key, which significantly increases your rate limit allowance.

The 'Repository disabled' error occurs when GitHub has disabled access to a repository due to account-level issues. This typically means the repository owner's account has been flagged for billing problems, Terms of Service violations, or security concerns.

This error occurs when pushing to an Azure DevOps repository that has a branch policy requiring commits to be linked to work items. You must include a work item reference in your commit message or link work items through the Azure DevOps interface before pushing.

This message appears on GitHub when your forked branch has diverged from the upstream repository. Your fork contains commits not in the original repo (ahead) and is missing commits from the original (behind). Syncing your fork resolves this divergence.

The 'error: invalid path' message occurs when Git tries to checkout files with names reserved by Windows, such as CON, PRN, AUX, or NUL. Rename the problematic files on a non-Windows system or use sparse checkout to skip them.

This error occurs when your Git credential (SSH key or Personal Access Token) hasn't been authorized for an organization that uses SAML Single Sign-On. You need to authorize your credential through GitHub's settings after authenticating with your organization's identity provider.

GitHub Copilot blocks suggestions that match existing public code to prevent potential license violations. This notification appears when Copilot's duplicate detection filter identifies code that closely resembles code found in public repositories on GitHub.

This error occurs when a GitHub Enterprise or organization has configured an IP allow list that blocks your current IP address. Your organization administrator needs to add your IP address to the allow list, or you need to connect from an approved network.

This error occurs when Git is not installed on your system or the Git executable is not in your shell's PATH environment variable. The fix involves installing Git or configuring your PATH to include the Git binary directory.

This GitLab error occurs when you try to push directly to a protected branch without the required permissions. Protected branches in GitLab require merge requests and appropriate access levels to accept changes.

GitHub rejects pushes when files exceed 100 MB, displaying the GH001 error code. To fix this, you must remove the large file from your commit history using git reset, BFG Repo-Cleaner, or git filter-repo, then either exclude the file from version control or set up Git LFS to handle large files.

This error occurs when GitLab's Secret Push Protection detects potential secrets (API keys, tokens, passwords, or private keys) in your commits. You must either remove the secrets from your commits, rotate the exposed credentials, or explicitly skip the check for false positives.

This GitLab CI/CD error occurs when your pipeline job cannot find an available runner to execute it. The issue is typically caused by missing runner registration, tag mismatches, or disabled shared runners. To fix it, verify your runner configuration, enable shared runners, or register a new runner for your project.

This Azure DevOps error occurs when you try to complete a pull request that hasn't met all the required branch policies. You'll need to satisfy the policy requirements such as reviewer approvals, successful builds, linked work items, or resolved comments before the PR can be merged.

This Bitbucket Pipelines error occurs when one or more steps in your CI/CD pipeline fail during execution. The failure can stem from test failures, build errors, configuration issues, or resource limits. To resolve it, examine the pipeline logs, identify the root cause, and fix the underlying issue in your code or configuration.

This error occurs on Windows when Git cannot access a file because another application has an exclusive lock on it. Common culprils include IDEs, editors, antivirus software, or Windows Explorer preview. The solution involves identifying and closing the process holding the file lock, or using tools to forcibly release it.

This error occurs when Git encounters a file path containing characters that are invalid on Windows filesystems. Characters like < > : " | ? * cannot be used in Windows filenames, causing checkout failures when repositories created on Linux/macOS contain such files.

This error occurs when Git on Windows cannot communicate with remote repositories because Windows OpenSSH is misconfigured or conflicts with Git's bundled SSH client. The fix involves configuring Git to use the correct SSH executable or properly setting up Windows OpenSSH.

This macOS error occurs when Git tries to access credentials stored in Keychain but the system blocks the request because no user interaction is possible. This commonly happens in automated environments like CI/CD pipelines, SSH sessions, cron jobs, or when the Keychain is locked.

Git warns that file paths have collided due to a case-sensitive rename on a case-insensitive filesystem. This happens when a repository contains files that differ only in letter case (like README.md and readme.md), which macOS APFS or HFS+ cannot store separately. Fix by renaming files in the repository or using a case-sensitive disk image.

This error occurs when Git cannot read or write to the .git/config file due to file system permission restrictions. The fix typically involves correcting the ownership of the .git directory to match your current user.

The 'fatal: cannot create pack: Too many open files' error occurs when Git exceeds the operating system's limit on the number of files a process can open simultaneously. This commonly happens during garbage collection, push, fetch, or repack operations on large repositories with many loose objects.

The 'detached HEAD' state in Git means you're not on any branch - instead, your HEAD points directly to a specific commit. This is normal and expected in CI/CD pipelines that checkout specific commits or tags. Understand when it's safe to ignore and when you need to create a branch.

This error occurs when your CI/CD pipeline tries to checkout or clone a repository that uses Git LFS, but the CI runner lacks git-lfs. Configure your checkout action or install git-lfs in your pipeline script to resolve it.

The 'fatal: unknown option --no-optional-locks' error occurs when a tool or script invokes Git with the --no-optional-locks flag, but the installed Git version is too old to support this option. This typically happens in CI/CD pipelines, IDEs, or build systems that expect a newer Git version.

This error occurs when a Git authentication token expires during a long-running CI/CD build process. The token that was valid at the start of the job becomes invalid before Git operations complete, causing authentication failures mid-build.

The 'gpg failed to sign the data' error with 'Unusable secret key (key expired)' occurs when your GPG signing key has passed its expiration date. Git cannot use an expired key to sign commits or tags, but you can renew the key's expiration without creating a new one.

This Jenkins error occurs when the Git plugin cannot locate the specified branch or commit in your repository. Common causes include branch name mismatches (master vs main), missing credentials, incorrect branch specifier syntax, or undefined pipeline variables. The fix typically involves updating the branch specifier to match your actual repository configuration.

The 'gpg failed to sign the data' error with 'can't connect to the gpg-agent' occurs when the GPG agent daemon is not running or is inaccessible. This prevents Git from creating cryptographic signatures for commits and tags. The fix typically involves starting the agent or configuring the GPG_TTY environment variable.

The 'Bad passphrase' error occurs when Git attempts to sign a commit or tag using GPG, but the passphrase provided (or cached) for your GPG key is incorrect. This typically happens when the GPG agent cache has expired, the passphrase was entered incorrectly, or macOS Keychain has stored an invalid passphrase.

This error appears when trying to unregister or stop background maintenance on a repository that was never registered with the Git maintenance scheduler in the first place.

The 'replace ref already exists' error occurs when you try to create a git replace reference for an object that already has one. Use the --force flag to overwrite, or delete the existing replacement first.

The 'fatal: Not a valid object name ... for replace' error occurs when Git cannot find the object (commit, tree, or blob) you're trying to replace. This happens when the specified SHA hash doesn't exist in your repository's object database.

This error occurs when the scalar command cannot register a Git repository for optimized maintenance and background operations. Common causes include missing 'origin' remote, corrupted scalar configuration, or permission issues. The fix typically involves ensuring a valid remote exists or cleaning up stale scalar entries.

This error occurs when Git tries to create a file with characters that are illegal on your operating system's filesystem. Windows has strict filename restrictions that Linux and macOS don't, causing cross-platform compatibility issues.

The 'multi-pack-index verification failed' error occurs when Git's MIDX file becomes corrupted or out of sync with the actual pack files. Regenerating the multi-pack-index typically resolves the issue.

Git cannot launch the configured sequence editor when starting an interactive rebase. This typically occurs when the editor is misconfigured, missing, or incompatible with the terminal environment.

The Scalar command is not available in your Git installation. Scalar is a repository management tool for large monorepos that was integrated into Git v2.38+.

The 'cannot run git-askpass' error occurs when Git cannot find or execute the askpass helper program used for credential prompts. This typically happens in non-interactive environments like CI/CD pipelines, Docker containers, or when IDE configurations point to missing executables.

This error occurs when Git's index file (.git/index) becomes corrupted, typically due to power loss, system crashes, or abrupt process termination during Git operations. The fix involves removing the corrupted index and regenerating it from HEAD.

This Git warning appears when your repository uses the deprecated grafts file to modify commit history. Git 2.46+ actively warns about this feature, which will be removed in Git 3.0. Convert grafts to git replace refs for a permanent fix.

This Git error occurs during checkout, clone, or pull when Git cannot create a directory because a file or another directory with the same name already exists at that path. Common causes include file/directory name conflicts, Windows path limitations, and case sensitivity issues.

This error occurs when SSH cannot verify the remote server's identity because its host key is missing from or mismatched in your known_hosts file. The fix typically involves adding the server's host key to your SSH configuration.

This Git error occurs when cloning or pulling a repository containing files with trailing periods (dots) on Windows. The Windows filesystem API rejects these filenames, causing checkout failures even though Unix-like systems permit them.

This Git warning occurs when merging branches that have divergent submodule histories. Git cannot automatically resolve which commit the submodule should point to because both branches have made independent changes to the submodule reference.

This informational message appears during a git clean dry run, indicating that an untracked directory would be deleted. Use the -d flag with -f to actually remove directories, or review the output to ensure you won't lose important files.

This error occurs when you try to use git mv on a file that Git is not tracking. Either add the file to Git first, or use regular mv followed by git add instead.

This error occurs when you try to rename or move a file using git mv but a file already exists at the destination path. Git refuses to overwrite existing files by default to protect against accidental data loss.

The 'patch does not apply' error occurs when Git cannot match the context lines in a patch file to your current codebase. This commonly happens when the patch has already been applied, the code has changed since the patch was created, or there are whitespace differences.

This error occurs when Git cannot find the branch, tag, or commit you specified in a git archive command. The reference either does not exist locally, has not been fetched from a remote, or contains a typo.

Git filter-branch refuses to run because backup refs from a previous operation already exist. You can either force overwrite the backup with -f flag or manually delete the refs/original namespace.

This error occurs when Git cannot find the reflog entry you referenced. Reflog entries expire after 90 days by default, or the reference may have been garbage collected.

This error occurs when GPG cannot verify a Git commit or tag signature because the signer's public key is missing from your keyring or an unsupported cryptographic algorithm was used. The fix involves importing the required public key from a keyserver or the signer directly.

This GPG warning appears when verifying signed Git commits or tags when the signing key is not in your web of trust. The signature is cryptographically valid, but GPG cannot confirm who owns the key. Fix this by signing the key or setting its trust level.

This error occurs when Git tries to verify a GPG-signed commit or tag, but the signer's public key isn't in your local GPG keyring. Import the missing public key from a keyserver or directly from the signer to verify the signature.

This error occurs when Git attempts to sign a commit using SSH but encounters a format incompatibility between your SSH key and the ssh-keygen tool. The fix typically involves adding your SSH key to the ssh-agent, updating your OpenSSH version, or reconfiguring your Git signing settings.

The 'Failed to connect to proxy' error occurs when Git is configured to use a proxy server that is unavailable, unreachable, or incorrectly configured. This commonly happens when proxy settings from a corporate environment persist after leaving the network, or when environment variables override Git's connection settings.

The HTTP 407 error occurs when Git cannot authenticate with a proxy server that requires credentials. This typically happens in corporate environments where network traffic must pass through an authenticated proxy, and Git hasn't been configured with the correct proxy credentials or authentication method.

This error occurs when Git attempts to use a Proxy Auto-Configuration (PAC) file but fails because Git does not natively support PAC files. In corporate environments where network traffic is routed through proxies configured via PAC scripts, Git operations like clone, push, and pull will fail until you manually extract and configure the proxy settings.

The 'Authentication failed (proxy requires basic auth)' error occurs when Git cannot authenticate with a corporate or network proxy server that requires username and password credentials. This is resolved by configuring Git to send basic authentication credentials to the proxy.

This error occurs when Git ignores the no_proxy or NO_PROXY environment variable and still routes requests through a proxy server for hosts that should be bypassed. The fix involves using Git's native http.noProxy configuration or URL-specific proxy settings instead of relying on the environment variable.

This error occurs when Git cannot read a required tree object in a partial clone created with --filter=tree:0. Treeless clones only download commit objects initially, fetching trees on demand. The fix typically involves converting to a full clone, using a blobless clone instead, or ensuring network connectivity to fetch missing objects.

The 'missing blob object in blobless clone' error occurs when Git cannot locate a required blob that was intentionally excluded during a partial clone. This happens when the promisor remote is unavailable or when operating offline with a blobless repository.

This error occurs when git rev-list encounters a missing, corrupted, or invalid object (commit, blob, or tree) in the repository. It typically indicates repository corruption or incomplete data transfer.

Git has detected a UTF-8 Byte Order Mark at the beginning of a file. While valid UTF-8, BOMs can cause cross-platform compatibility issues with diff, merge, and patch operations.

Git fails to compress objects during pack generation, typically when pushing large repositories or running garbage collection. This memory-intensive operation can fail due to insufficient resources or corrupt objects.

Git warns when you attempt to commit files larger than 50 MB, as large binary files can bloat repositories and slow down operations. This warning recommends using Git Large File Storage (LFS) for better handling of large assets.

Git exhausts available memory when creating, compressing, or processing pack files during clone, fetch, push, or repack operations. This typically occurs with large repositories or on systems with limited RAM.

This error occurs when attempting to use git clone --shallow-exclude with a remote server that doesn't support this advanced shallow cloning feature. The server may be running an older Git version or have protocol limitations.

This warning appears when using git clone --filter=blob:limit with large binary files. It indicates blobs exceeding the specified size limit are being excluded from the partial clone.

This error occurs when attempting to clone a repository with --shallow-since on a Git server that doesn't support this feature. The server either runs an older Git version or uses a "dumb" HTTP transport that lacks shallow clone capabilities.

Git cannot find a filter driver defined in .gitattributes, typically because the filter (like Git LFS) is not installed or configured in your Git config.

Git warns that a pattern in your .gitattributes file uses invalid syntax and will be ignored. This typically occurs from using unsupported wildcards, brace expansion, or negative patterns.

Git reports invalid patterns in .gitignore when using incorrect syntax, unsupported regex, or invalid special characters. This prevents proper file exclusion and can cause unexpected tracking behavior.

Git cannot execute a custom merge driver specified in .gitattributes. This happens when the driver is referenced but not properly configured in your Git config, or when the driver command is unavailable.

This error occurs when git describe cannot find any tags in the repository history. The command requires at least one tag to generate version-like output based on the most recent tag.

Git shortlog returns empty output when run in non-interactive environments like scripts, CI systems, or when no revision is specified. This occurs because shortlog expects either a terminal or explicit revision argument.

The 'scalar clone failed to initialize repository' error occurs when Scalar cannot properly set up the repository workspace. This typically happens due to installation path mismatches, authentication issues, or conflicts with existing Git configurations.

This error occurs when Git's split index optimization becomes out of sync. The split index feature stores the index in two parts to speed up operations in large repositories. The fix involves disabling and optionally re-enabling the split index mode.

This warning occurs when Git detects corruption in the reachability bitmap index file, which is used to optimize operations like fetching and cloning. The fix involves regenerating the bitmap file using git repack or git gc.

Git rejects paths containing null bytes (ASCII 0x00) because its internal design uses null-terminated strings. This commonly occurs when files are encoded in UTF-16 or UTF-32 instead of UTF-8.

This Git warning appears when cloning a repository that has no commits. While non-fatal, it often signals a newly created repo, wrong branch configuration, or access issues. Verify the repository has content, check the default branch, or ensure proper authentication.

The server closed the connection during SSH authentication or data transfer. This typically happens due to network issues, SSH configuration problems, or server-side restrictions like rate limiting or IP blocking.