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Angular Common Errors — Module Not Found, Dependency Injection, and Template Errors

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Overview

Fix common Angular errors including NG0301 (module not found), NG0200 (circular dependency), template parsing errors, and dependency injection failures.

Key Details

  • Angular uses a module-based architecture with NgModules or standalone components
  • NG error codes (NG0200, NG0301, etc.) provide specific debugging guidance
  • Dependency injection errors occur when a service is not properly provided in the correct injector scope
  • Template errors from property binding, event binding, or structural directive misuse are common
  • Angular CLI serves detailed error messages with links to the Angular error encyclopedia

Common Causes

  • Component or pipe not declared in any NgModule or not marked as standalone
  • Service not provided in the root injector or the correct module/component scope
  • Circular dependency between modules or services
  • Template syntax error — incorrect binding syntax, missing pipes, or structural directive conflicts

Steps

  1. 1For NG0301: ensure the component/pipe is declared in an NgModule or marked as standalone: true
  2. 2For DI errors: add @Injectable({ providedIn: 'root' }) to services or add to providers array
  3. 3Check the Angular error page: angular.dev/errors/[error-code] for specific guidance
  4. 4For circular deps: refactor shared code into a separate module or use forwardRef()
  5. 5Run 'ng lint' and 'ng build --configuration production' to catch template and compilation errors early

Tags

angularmoduledependency-injectiontemplateerror

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Frequently Asked Questions

NG0301: Export not found! A component, directive, or pipe referenced in a template is not declared or imported. Add it to the NgModule declarations or import a module that exports it.