[(ngmodel)] Eingabefehler

//Error: Can't bind to 'ngModel' since it isn't a known property of 'input'
//Solution: you need to import the FormsModule on the app.module.ts file
...
import { FormsModule } from '@angular/forms'; 

@NgModule({
  imports: [
	...,
    FormsModule
  ], 
  declarations: []
  }
)
Watcher O_O