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Most looked-up errors

1,331 errors documented
403🌐 HTTP

HTTP 403 Forbidden

The server understood the request but refuses to authorize it — you (or the server process) are not allowed to access this resour…

404🌐 HTTP

HTTP 404 Not Found

The server can’t find anything at the requested URL.

200🌐 HTTP

HTTP 200 OK (but something is still wrong)

The request succeeded at the HTTP level — yet the page is blank, the data is wrong, or an error is hidden inside the response bod…

0xC000007B🪟 Windows

The application was unable to start correctly (0xc000007b)

A program loaded a DLL of the wrong architecture (32-bit vs 64-bit) or a corrupted runtime library.

ClassNotFoundException☕ Java

java.lang.ClassNotFoundException / NoClassDefFoundError

The JVM couldn’t find a class on the classpath at runtime.

400🌐 HTTP

HTTP 400 Bad Request

The server could not understand the request because its syntax, headers or body are malformed or invalid.

Git SSL certificate problem🌿 Git

fatal: unable to access 'https://…': SSL certificate problem: unable to get local issuer certificate

Git doesn’t trust the HTTPS server’s certificate — corporate proxy, self-hosted Git with an internal CA, or outdated CA bundle.

1045🐬 MySQL

MySQL ERROR 1045 (28000): Access denied for user

MySQL rejected the login — wrong password, wrong user/host combination, or the user doesn’t exist.

522🟧 Cloudflare

Cloudflare Error 522: Connection Timed Out

Cloudflare’s TCP connection to your origin timed out — the origin didn’t answer at all.

MODULE_NOT_FOUND🟩 Node.js

Error: Cannot find module 'x' (MODULE_NOT_FOUND)

Node can’t resolve the module path — the package isn’t installed, or a relative path/extension is wrong.

URIError🟨 JavaScript

URIError: URI malformed

decodeURIComponent/decodeURI received an invalid percent-encoded sequence.

422🌐 HTTP

HTTP 422 Unprocessable Content

The request is well-formed, but the data fails validation (e.g. invalid email, missing required field).

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403 Forbidden
nginx/1.24.0
GET /api/users
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