All Errors

This error occurs when trying to use getServerSideProps outside of page components in Next.js. The function must be exported from files in the /pages directory, not from regular components or when using the App Router.

This error occurs when trying to use React client hooks like useState, useEffect, or useRef in a Server Component. In Next.js 13+, all components are Server Components by default and must be explicitly marked as Client Components to use client-side hooks.

This error occurs when you try to import something from a module that doesn't export it. It's typically caused by mismatched import/export syntax, incorrect export names, or mixing default and named exports incorrectly.

This React hydration warning occurs when CSS-in-JS libraries inject style tags during server-side rendering that React does not expect during client-side hydration, causing a mismatch between server and client HTML.

This Next.js build error occurs when you try to cache dynamic route segments without proper revalidation configuration. The error indicates that routes with dynamic parameters like [slug] or [id] cannot use indefinite caching because their content is user-specific or request-dependent.

This error occurs when CommonJS module syntax (require/module.exports) is used in a browser environment without proper bundling or transpilation. Browsers natively support ES modules but do not recognize the CommonJS "exports" variable.

This error occurs when trying to pass a key prop to React's shorthand Fragment syntax (<>...</>). Only the explicit <Fragment> syntax supports the key attribute, which is needed when rendering lists of fragments.

This error occurs when you try to directly import a client component into a server component in Next.js App Router. The "use client" directive creates a module boundary between server and client code, preventing server components from directly importing client modules.

This error occurs when React.forwardRef cannot be imported or called properly, typically due to incorrect React imports, version mismatches between react and react-dom, or using incompatible library versions that don't support forwardRef.

This React warning appears when rendering arrays or lists without assigning unique key props to each element. Keys help React identify which items have changed, been added, or removed, enabling efficient re-rendering and preventing UI bugs.

MySQL error 1559 occurs when you try to change the binary log format while temporary tables are open. The fix is to close all temporary tables before attempting to switch the replication format.

This React error occurs when a component attempts to update another component's state during the render phase. React prevents this to maintain a predictable rendering flow and avoid infinite loops or race conditions.

This error occurs when you try to render a JavaScript object, array, or Promise directly in JSX. React can only render primitive values (strings, numbers) and React elements, not plain objects.

This React error occurs when a component triggers too many consecutive state updates, usually from calling setState in useEffect without proper dependencies, or in event handlers without guards. React limits nested updates to around 50 to prevent infinite loops that would freeze the browser.

This error occurs when trying to use the legacy getInitialProps data fetching method in Next.js App Router. The App Router introduced in Next.js 13+ uses a different data fetching paradigm based on Server Components and the native fetch API, making getInitialProps incompatible.

This React warning occurs when a forwardRef render function is defined with an incorrect number of parameters. React expects forwardRef components to accept exactly two parameters: props and ref, but the function signature does not match this requirement.

This error occurs when trying to use React Hooks like useState or useEffect inside class components. Hooks only work in function components and custom hooks, enforcing one of the fundamental Rules of Hooks that React uses to maintain state consistency.

This warning indicates that promises are being continuously created inside setInterval or setTimeout callbacks without proper cleanup, causing memory consumption to grow unbounded. The callback functions and their closures remain referenced, preventing garbage collection.

This error occurs when npm or Node.js cannot locate a package.json file in the directory where you are running commands. The package.json file is required for dependency management and project configuration.

This message appears when Create React App builds fail in CI environments due to ESLint warnings or webpack warnings being treated as errors. This is intentional behavior to ensure code quality, but can be disabled if needed.