NullInjectorError: No provider for kE! code example

Example 1: NullInjectorError: No provider for HttpClient!

@NgModule({
...
imports:[ HttpClientModule ]
...
})

Example 2: NullInjectorError: No provider for SwPush!

imports: [
    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production }),
],