NullInjectorError: R3InjectorError(AppModule)[MainServiceService -> HttpClient -> HttpClient -> HttpClient]: NullInjectorError: No provider for HttpClient! code example
Example 1: NullInjectorError: No provider for HttpClient!
import { HttpClientModule } from '@angular/common/http';
Example 2: No provider for HttpClient!
import { HttpClientModule } from '@angular/common/http';