/TypeScript/Error NG8002: Can't bind to 'ngbCollapse' since it isn't a known property of 'ul'.

Error NG8002: Can't bind to 'ngbCollapse' since it isn't a known property of 'ul'.

// take care about your app.module.ts   
import { ReactiveFormsModule } from '@angular/forms';
@NgModule({
  declarations: [
    	// not in there
    ]})

  imports: [
    ReactiveFormsModule 
  ]

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