angularmaints5 ERROR NullInjecto

angular - main.ts:5 ERROR NullInjectorError: R3InjectorError - Stack Overflow
main.ts:5 ERROR NullInjectorError: R3InjectorError(Standalone[_AppComponent])[Firestore3 -> Firestor
angularmaints5 ERROR NullInjectorError R3InjectorErrorStack Overflow
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