Error map

Features not supported with output: export (headers, redirects, image loader) Next.js: Specified "headers" cannot be used with "output: export" / Image Optimization using the default loader is not compatible with `{ output: 'export' }`

Next.js · layer 1, On your device

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1 · On your device 4 · Application & API 6 · Platform & cloud 7 · Build & delivery
Features not supported with output: export (headers, redirects, image loader) — Next.js: Specified "headers" cannot be used with "output: export" / Image Optimization using the default loader is not compatible with `{ output: 'export' }` (Next.js)Features no…next/image hostname — Error: Invalid src prop on `next/image`, hostname "x" is not configured under images in your `next.config.js` (React)next/image hostnameConflicting app and page file was found — Next.js: ⨯ Conflicting app and page file was found, please remove the conflicting files to continue: "pages/index.tsx" - "app/page.tsx" (Next.js)Conflicting app and…Invalid next.config.js options detected — Next.js: Invalid next.config.js options detected: Unrecognized key(s) in object: 'xyz' (Next.js)Invalid next.config…Page is missing generateStaticParams() (output: export) — Next.js: Page "/blog/[slug]" is missing "generateStaticParams()" so it cannot be used with "output: export" config (Next.js)Page is missing gen…next build: JavaScript heap out of memory — Next.js: FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory (during next build) (Next.js)next build: JavaScr…next.config.js: ES Module / require error — Next.js: Error [ERR_REQUIRE_ESM]: require() of ES Module next.config.js / SyntaxError: Unexpected token 'export' (Next.js)next.config.js: ES …next build: fetch failed ECONNREFUSED (build-time API) — Next.js: Error occurred prerendering page "/blog" TypeError: fetch failed { cause: Error: connect ECONNREFUSED 127.0.0.1:3000 } (Next.js)next build: fetch f…ImagePullBackOff — Kubernetes: ImagePullBackOff / ErrImagePull (Kubernetes)ImagePullBackOffexec format error — exec /usr/local/bin/docker-entrypoint.sh: exec format error (Docker)exec format errorHydration failed — Error: Hydration failed because the initial UI does not match what was rendered on the server (React)Hydration failedpath-to-regexp — TypeError: Missing parameter name at 1 (path-to-regexp) (Node.js)path-to-regexpNo routes matched — No routes matched location "/x" (React)No routes matchedPrerender error — Error occurred prerendering page "/x". Read more: https://nextjs.org/docs/messages/prerender-error (React)Prerender errorMiddleware matcher: Capturing groups are not allowed — Next.js: Error: Invalid middleware found. Capturing groups are not allowed in matcher / `matcher` values must start with `/` (Next.js)Middleware matcher:…CORS error calling Next.js API route / route handler — Browser: Access to fetch at 'https://api.example.com/api/data' from origin 'https://app.example.com' has been blocked by CORS policy (Next.js route handler) (Next.js)CORS error calling …useSearchParams() should be wrapped in a suspense boundary — Next.js: useSearchParams() should be wrapped in a suspense boundary at page "/". Read more: https://nextjs.org/docs/messages/missing-suspense-with-csr-bailout (Next.js)useSearchParams() s…Module not found: Can't resolve 'x' (Next.js build) — Next.js: Module not found: Can't resolve '@/components/Button' / 'lodash' in '/app/src' (Next.js)Module not found: C…Failed to compile: ESLint errors during next build — Next.js: Failed to compile. ./src/app/page.tsx 12:7 Error: 'x' is assigned a value but never used. @typescript-eslint/no-unused-vars (Next.js)Failed to compile: …ELIFECYCLE — npm ERR! code ELIFECYCLE / Command failed with exit code 1 (npm)ELIFECYCLEgyp ERR! — gyp ERR! build error / node-gyp rebuild failed (npm)gyp ERR!heap out of memory — FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory (Node.js)heap out of memoryERR_REQUIRE_ESM — Error [ERR_REQUIRE_ESM]: require() of ES Module not supported (Node.js)ERR_REQUIRE_ESMSyntaxError import — SyntaxError: Cannot use import statement outside a module (Node.js)SyntaxError importERR_UNKNOWN_FILE_EXTENSION — TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" (Node.js)ERR_UNKNOWN_FILE_EX…ERR_OSSL_EVP_UNSUPPORTED — Error: error:0308010C:digital envelope routines::unsupported (Node.js)ERR_OSSL_EVP_UNSUPP…prisma generate — Error: @prisma/client did not initialize yet. Please run "prisma generate" (Node.js)prisma generatenode-sass — Error: Node Sass does not yet support your current environment (Node.js)node-sass

Directly related (7)

next/image hostnameReact

Error: Invalid src prop on `next/image`, hostname "x" is not configured under images in your `next.config.js`

next/image refuses to optimize images from domains not allowed in next.config.js.

Conflicting app and page file was foundNext.js

Next.js: ⨯ Conflicting app and page file was found, please remove the conflicting files to continue: "pages/index.tsx" - "app/page.tsx"

The same URL is defined in both the `app` and `pages` directories.

Invalid next.config.js options detectedNext.js

Next.js: Invalid next.config.js options detected: Unrecognized key(s) in object: 'xyz'

`next.config.js` contains an option Next.js doesn't recognise (typo, wrong version, or moved key).

Page is missing generateStaticParams() (output: export)Next.js

Next.js: Page "/blog/[slug]" is missing "generateStaticParams()" so it cannot be used with "output: export" config

A dynamic route can't be statically exported without telling Next.js which paths to generate.

next build: JavaScript heap out of memoryNext.js

Next.js: FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory (during next build)

Node ran out of memory while building a large Next.js app (or on a small CI/Vercel runner).

next.config.js: ES Module / require errorNext.js

Next.js: Error [ERR_REQUIRE_ESM]: require() of ES Module next.config.js / SyntaxError: Unexpected token 'export'

The config file uses ESM syntax in a CommonJS context (or the reverse), so Node can't load it.

next build: fetch failed ECONNREFUSED (build-time API)Next.js

Next.js: Error occurred prerendering page "/blog" TypeError: fetch failed { cause: Error: connect ECONNREFUSED 127.0.0.1:3000 }

During `next build` a page tried to fetch data from a server (often your own app or an API) that isn't running yet.

Two steps away (20)

ImagePullBackOffKubernetes

Kubernetes: ImagePullBackOff / ErrImagePull

The node can’t pull the container image — wrong name/tag, missing registry credentials, or registry unreachable.

exec format errorDocker

exec /usr/local/bin/docker-entrypoint.sh: exec format error

The container tried to run a binary built for a different CPU architecture (arm64 vs amd64) — or a script with a broken shebang /…

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.

path-to-regexpNode.js

TypeError: Missing parameter name at 1 (path-to-regexp)

An Express 5 (path-to-regexp v8) route uses old wildcard syntax like '*' or '/:id?'.

No routes matchedReact

No routes matched location "/x"

React Router found no route definition for the current URL.

Prerender errorReact

Error occurred prerendering page "/x". Read more: https://nextjs.org/docs/messages/prerender-error

A page threw an error while Next.js was rendering it at build time.

Middleware matcher: Capturing groups are not allowedNext.js

Next.js: Error: Invalid middleware found. Capturing groups are not allowed in matcher / `matcher` values must start with `/`

The `config.matcher` regex in middleware contains an unsupported pattern (capturing group) or invalid syntax.

CORS error calling Next.js API route / route handlerNext.js

Browser: Access to fetch at 'https://api.example.com/api/data' from origin 'https://app.example.com' has been blocked by CORS policy (Next.js route handler)

A cross-origin request to your Next.js API route is blocked because the response lacks CORS headers.

useSearchParams() should be wrapped in a suspense boundaryNext.js

Next.js: useSearchParams() should be wrapped in a suspense boundary at page "/". Read more: https://nextjs.org/docs/messages/missing-suspense-with-csr-bailout

A Client Component using `useSearchParams` is statically rendered, so the build needs a Suspense boundary for the client-only par…

Module not found: Can't resolve 'x' (Next.js build)Next.js

Next.js: Module not found: Can't resolve '@/components/Button' / 'lodash' in '/app/src'

Webpack/Turbopack couldn't resolve an import — wrong path/alias, missing dependency or case mismatch.

Failed to compile: ESLint errors during next buildNext.js

Next.js: Failed to compile. ./src/app/page.tsx 12:7 Error: 'x' is assigned a value but never used. @typescript-eslint/no-unused-vars

`next build` runs ESLint and fails the build on lint errors.

ELIFECYCLEnpm

npm ERR! code ELIFECYCLE / Command failed with exit code 1

An npm script (build, start, test, postinstall) exited with an error. ELIFECYCLE is only the wrapper — the real error is printed…

gyp ERR!npm

gyp ERR! build error / node-gyp rebuild failed

A dependency with native C/C++ code couldn’t compile — missing build tools, Python, or an unsupported Node version.

heap out of memoryNode.js

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory

The V8 heap hit its limit — a large build (webpack, tsc, Next.js) needs more memory, or the app leaks.

ERR_REQUIRE_ESMNode.js

Error [ERR_REQUIRE_ESM]: require() of ES Module not supported

CommonJS code used `require()` on a package that is ES-module-only (node-fetch 3, chalk 5, nanoid 4, got 12…).

SyntaxError importNode.js

SyntaxError: Cannot use import statement outside a module

An `import` statement ran in a context treated as CommonJS (Node without "type": "module", a browser script without type="module"…

ERR_UNKNOWN_FILE_EXTENSIONNode.js

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts"

Node tried to run a TypeScript file as ESM without a TypeScript loader.

ERR_OSSL_EVP_UNSUPPORTEDNode.js

Error: error:0308010C:digital envelope routines::unsupported

An old build tool (webpack 4, old react-scripts) uses a hash algorithm that OpenSSL 3 in Node 17+ disables.

prisma generateNode.js

Error: @prisma/client did not initialize yet. Please run "prisma generate"

The generated Prisma Client is missing or out of date.

node-sassNode.js

Error: Node Sass does not yet support your current environment

node-sass (deprecated) has no binary for your Node version/OS.

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