Angular Error : StaticInjectorError (Platform: core)[e -> t]:

Question

As I am build the APK with --prod I am getting the error below

    ERROR Error: StaticInjectorError[e -> t]: 
  StaticInjectorError(Platform:         


        

Answer 1

You are trying to use a service that is not listed in providers of your AppModule or inside you component.ts. Add the service to a providers list to make it work.

In app.modules if you want that service to be global (related to app context).

@NgModule({
    declarations: [...],
    imports: [...],
    bootstrap: [...],
    entryComponents: [...],
    providers: [
        MyService
    ]
})

Or in your component.ts if you want that service to be contextual to desired component.

@Component({
    selector: '...',
    templateUrl: '...',
    providers: [MyService]
})

Do not add it in both files. Also don't forget to import that service when you inject it either in app.modules or component.

import { MyService } from '../services/myservice';

This question also may help you: Error: No provider for t

Answer 2

This happens because you did not add the services used to build the module

example:

1. component

@Component({
  selector: 'app-sample',
  templateUrl: './sample.component.html',
  styleUrls: ['./sample.component.scss']
})
export class SampleComponent implements OnInit {

constructor(private localServiceName: YourService) {
}

  ngOnInit() {
  }

}

2. module

@NgModule({
    declarations: [SampleComponent]
})

change to

@NgModule({
    declarations: [SampleComponent]
    providers: [ YourService ]
})