Once done, we have to register the new component within the app.module.shared.ts file, just like we did a hundred times already (new lines are highlighted):

[...]

import { LoginComponent } from './components/login/login.component';
import { LoginFacebookComponent } from './components/login/login.facebook.component';

@NgModule({
    declarations: [

[...]

        LoginComponent,
        LoginFacebookComponent,

[...]