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Troubleshooting guide for Angular runtime and compiler errors with per-code reference docs.
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Generates Angular code and provides architectural guidance. Trigger when creating projects, components, or services, or for best practices on reactivity (signals, linkedSignal, resource), forms, dependency injection, routing, SSR, accessibility (ARIA), animations, styling (component styles, Tailwind CSS), testing, or CLI tooling.
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| name | angular-errors |
| description | Troubleshooting guide for Angular runtime and compiler errors with per-code reference docs. |
| license | MIT |
| metadata | {"author":"Copyright 2026 Google LLC","version":"1.0"} |
Use this skill when Angular reports an NGxxxx error code and you need fast root-cause and fix guidance.
NG0100, NG8002, etc.) from terminal or browser console.references/ (for example references/NG0201.md).Why this error happens, How to debug, and How to fix.Runtime errors occur while your application is running. This section summarizes common Angular runtime errors.
| Code | Name |
|---|---|
| NG0100 | Expression Changed After Checked |
| NG01101 | Wrong Async Validator Return Type |
| NG01203 | Missing value accessor |
| NG0200 | Circular Dependency in DI |
| NG0201 | No Provider Found |
| NG0203 | inject() must be called from an injection context |
| NG0204 | Invalid Injection Token |
| NG0205 | Injector has already been destroyed |
| NG0207 | EnvironmentProviders in wrong context |
| NG0209 | Invalid multi provider |
| NG02200 | Missing Iterable Differ |
| NG02800 | JSONP support in HttpClient configuration |
| NG02802 | Headers not transferred by HttpTransferCache |
| NG0300 | Selector Collision |
| NG0301 | Export Not Found |
| NG0302 | Pipe Not Found |
| NG0401 | Missing Platform |
| NG0403 | Bootstrapped NgModule does not specify a root component |
| NG0500 | Hydration Node Mismatch |
| NG05000 | Hydration with unsupported Zone.js instance |
| NG0501 | Hydration Missing Siblings |
| NG0502 | Hydration Missing Node |
| NG0503 | Hydration Unsupported Projection of DOM Nodes |
| NG0504 | ngSkipHydration flag is applied to an invalid node |
| NG0505 | No hydration info in server response |
| NG0506 | Application remains unstable |
| NG0507 | HTML content was altered after server-side rendering |
| NG0602 | Disallowed function call inside reactive context |
| NG0750 | @defer dependencies failed to load |
| NG0751 | @defer behavior when HMR is enabled |
| NG0910 | Unsafe bindings on an iframe element |
| NG0912 | Component ID generation collision |
| NG0913 | Runtime Performance Warnings |
| NG0919 | Circular Dependency Detected |
| NG0950 | Required input is accessed before a value is set |
| NG0951 | Child query result is required but no value is available |
| NG0955 | Track expression resulted in duplicated keys for a collection |
| NG0956 | Tracking expression caused re-creation of DOM structure |
Compiler errors occur when the Angular compiler fails to process your code, usually due to syntax or structural issues. This section summarizes common Angular compiler errors.
| Code | Name |
|---|---|
| NG1001 | Argument Not Literal |
| NG2003 | Missing Token |
| NG2009 | Invalid Shadow DOM selector |
| NG3003 | Import Cycle Detected |
| NG6100 | NgModule.id set to module.id anti-pattern |
| NG8001 | Invalid Element |
| NG8002 | Invalid Attribute |
| NG8003 | Missing Reference Target |
Detailed per-code guidance is available in references/NGxxxx.md files.
If you need additional framework context, use the official Angular Errors guide.