Page has a @IonicPage decorator, but it does not have a corresponding “NgModule”

Question

I was working on page navigation in Ionic. After using ionic serve, I got this error:

The Page with .ts extension has a @IonicPage decorator, but

Answer 1

Using only:

import { IonicPage } from 'ionic-angular';

@IonicPage()

@Component({
  selector: 'page-abc',
  templateUrl: 'abc.html',
})