core.js:7813 Can't bind to 'ngForOf' since it isn't a known property of 'hero-card-drag-n-drop'. code example

Example: Can't bind to 'ngForOf' since it isn't a known property of 'div'.

// older Angular versions
// import {BrowserModule, CommonModule} from '@angular/common';

import { BrowserModule } from '@angular/platform-browser'
..
..
@NgModule({
  imports: [BrowserModule, /* or CommonModule */],
  ..
})