Identify the error in this custom structural directive code:

Identify the error in this custom structural directive code:

@Directive({ selector: '[appToggle]' })
export class ToggleDirective {
  constructor(private tpl: TemplateRef) {}

  @Input() set appToggle(condition: boolean) {
    if (condition) {
      this.tpl.createEmbeddedView();
    }
  }
}