angular

Can't bind to property — not a known property (NG0303)

NG0303.*Can't bind to '.+' since it isn't a known property

Fixes

1.Import the module that declares the directive/component (e.g., FormsModule for ngModel, ReactiveFormsModule for formControl)
2.Check for typos in the property name or directive selector
3.If it's a custom component input, ensure the component is declared/exported in the correct module

templatebindingmodules

Related Errors

ExpressionChangedAfterItHasBeenCheckedError (NG0100)

NG0100.*Expression has changed after it was checked

•Move the value change to ngAfterViewInit with a ChangeDetectorRef.detectChanges() call
•Use setTimeout(() => { ... }) to defer the change to the next cycle

Circular dependency in DI (NG0200)

NG0200.*Circular dependency in DI detected

•Break the cycle by injecting one service lazily with `@Inject(forwardRef(() => ServiceName))`
•Extract shared logic into a third service that both services depend on

NullInjectorError — missing provider

NullInjectorError: No provider for (\w+)

•Add the service to the `providers` array of the module or component that needs it
•Use `@Injectable({ providedIn: 'root' })` on the service class for app-wide singleton