Error map

NEXT_REDIRECT Next.js: Error: NEXT_REDIRECT (redirect() inside try/catch)

Next.js · layer 1, On your device

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1 · On your device 5 · Data 7 · Build & delivery
NEXT_REDIRECT — Next.js: Error: NEXT_REDIRECT (redirect() inside try/catch) (Next.js)NEXT_REDIRE…server-only — Next.js: You're importing a component that needs "server-only". That only works in a Server Component (Next.js)server-onlyDynamic server usage — Error: Dynamic server usage: Route /x couldn't be rendered statically because it used `cookies` (React)Dynamic server usagecookies() should be awaited — Next.js 15: Route "/x" used `cookies().get('token')`. `cookies()` should be awaited before using its value (Next.js)cookies() should be…Can't resolve 'fs' — Module not found: Can't resolve 'fs' (Next.js / webpack 5) (React)Can't resolve 'fs'needs useState — You're importing a component that needs useState. It only works in a Client Component but none of its parents are marked with "use client" (React)needs useStateFunctions cannot be passed — Error: Functions cannot be passed directly to Client Components unless you explicitly expose it by marking it with "use server". (React)Functions cannot be…unique key prop — Warning: Each child in a list should have a unique "key" prop (React)unique key propHydration failed — Error: Hydration failed because the initial UI does not match what was rendered on the server (React)Hydration failedElement type is invalid — Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined (React)Element type is inv…caching_sha2_password — Authentication plugin 'caching_sha2_password' cannot be loaded (MySQL)caching_sha2_passwo…old lockfile — npm WARN old lockfile — The package-lock.json file was created with an old version of npm, so supplemental metadata must be fetched (npm)old lockfilecb() never called — npm ERR! cb() never called! (npm)cb() never called

Directly related (3)

server-onlyNext.js

Next.js: You're importing a component that needs "server-only". That only works in a Server Component

A Client Component (or a file it imports) pulls in server-only code — database clients, secrets, next/headers or a module marked…

Dynamic server usageReact

Error: Dynamic server usage: Route /x couldn't be rendered statically because it used `cookies`

Next.js tried to statically render a route that reads request-specific data (cookies, headers, searchParams).

cookies() should be awaitedNext.js

Next.js 15: Route "/x" used `cookies().get('token')`. `cookies()` should be awaited before using its value

Since Next.js 15, cookies(), headers(), params and searchParams are async — they must be awaited.

Two steps away (9)

Can't resolve 'fs'React

Module not found: Can't resolve 'fs' (Next.js / webpack 5)

A Node.js built-in (fs, path, crypto, net) is imported into code that runs in the browser bundle.

needs useStateReact

You're importing a component that needs useState. It only works in a Client Component but none of its parents are marked with "use client"

In the Next.js App Router, a component using hooks or browser APIs is rendered as a Server Component.

Functions cannot be passedReact

Error: Functions cannot be passed directly to Client Components unless you explicitly expose it by marking it with "use server".

A Server Component passed a function prop to a Client Component.

unique key propReact

Warning: Each child in a list should have a unique "key" prop

When rendering a list with `.map()`, each element needs a stable, unique `key` so React can track items between renders.

Hydration failedReact

Error: Hydration failed because the initial UI does not match what was rendered on the server

The HTML rendered on the server differs from the first client render, so React (Next.js/Remix) can’t attach to it.

Element type is invalidReact

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined

JSX referenced a component that is undefined — almost always a default/named import mismatch.

caching_sha2_passwordMySQL

Authentication plugin 'caching_sha2_password' cannot be loaded

An old MySQL client/driver can’t use MySQL 8’s default authentication plugin.

old lockfilenpm

npm WARN old lockfile — The package-lock.json file was created with an old version of npm, so supplemental metadata must be fetched

The lockfile is lockfileVersion 1 (npm 6) and npm 7+ is upgrading it.

cb() never callednpm

npm ERR! cb() never called!

An old npm crash during install — usually network/cache corruption.

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