In the definition of app/home/home-view-model.ts in the Home UI section there is an error in the populateFlicks function.

It is defined as

populateFlicks(): void {
 this._flicks = FlickService().getInstance().getFlicks();
 }

but should be

populateFlicks(): void {
 this._flicks = FlickService.getInstance().getFlicks();
 }

That is, FlickService should not be called.