title: ASSERTION ERROR: Type passed in is not ComponentType, it does not have 'ɵcmp' property
body: <p>I get this error whenever the app is running, though is not causing me problems in current development (i think) I would like to understand this error and know where it comes, because I'm completely lost, I can't even post relevant code. But i'll try..</p>
  
  <p>So these are the main routes (appModule):</p>
  
  <pre><code>const routes: Routes = [
    {path:'home', component:HomeComponent, canActivate:[AuthGuardService]},
    {path:'detail/:id', component:DetailComponent},
    {path: 'register', component: RegisterComponent},
    {path:'login', component: LoginComponent},
    {path:'', redirectTo:'login', pathMatch: 'full'},
    {path:'**',  redirectTo:'login'}
  
  ];
  
  @NgModule({
    imports: [RouterModule.forRoot(routes)],
    exports: [RouterModule]
  })
  export class AppRoutingModule { }
  </code></pre>
  
  <p>I have a core module where all the components are registed, and i'm importing the <code>RouterModule.forChild([])</code>:</p>
  
  <pre><code>@NgModule({
    declarations: [HomeComponent, DetailComponent, RegisterComponent, LoginComponent],
    imports: [
      CommonModule,
      FormsModule,
      ReactiveFormsModule,
      RouterModule.forChild([])
    ]
  })
  export class CoreModule { }
  </code></pre>
  
  <p>The package.json:</p>
  
  <pre><code>{
    "name": "mat-shop",
    "version": "0.0.0",
    "scripts": {
      "ng": "ng",
      "start": "ng serve",
      "build": "ng build",
      "test": "ng test",
      "lint": "ng lint",
      "e2e": "ng e2e"
    },
    "private": true,
    "dependencies": {
      "@angular/animations": "~9.1.9",
      "@angular/cdk": "^9.2.4",
      "@angular/common": "~9.1.9",
      "@angular/compiler": "~9.1.9",
      "@angular/core": "~9.1.9",
      "@angular/forms": "~9.1.9",
      "@angular/localize": "~9.1.9",
      "@angular/material": "^9.2.4",
      "@angular/platform-browser": "~9.1.9",
      "@angular/platform-browser-dynamic": "~9.1.9",
      "@angular/router": "~9.1.9",
      "@ng-bootstrap/ng-bootstrap": "^6.1.0",
      "bootstrap": "^4.4.0",
      "rxjs": "~6.5.4",
      "tslib": "^1.10.0",
      "zone.js": "~0.10.2"
    },
    "devDependencies": {
      "@angular-devkit/build-angular": "~0.901.7",
      "@angular/cli": "~9.1.7",
      "@angular/compiler-cli": "~9.1.9",
      "@types/node": "^12.11.1",
      "@types/jasmine": "~3.5.0",
      "@types/jasminewd2": "~2.0.3",
      "codelyzer": "^5.1.2",
      "jasmine-core": "~3.5.0",
      "jasmine-spec-reporter": "~4.2.1",
      "karma": "~5.0.0",
      "karma-chrome-launcher": "~3.1.0",
      "karma-coverage-istanbul-reporter": "~2.1.0",
      "karma-jasmine": "~3.0.1",
      "karma-jasmine-html-reporter": "^1.4.2",
      "protractor": "~7.0.0",
      "ts-node": "~8.3.0",
      "tslint": "~6.1.0",
      "typescript": "~3.8.3"
    }
  }
  </code></pre>
  
  <p>EDIT appModule</p>
  
  <pre><code>@NgModule({
    declarations: [
      AppComponent,
    ],
    imports: [
      BrowserModule,
      HttpClientModule,
      BrowserAnimationsModule,
      CoreModule,
      NgbModule
  
    ],
    providers: [DataService, fakeBackendProvider, AuthService, AuthGuardService, ShoppingCartService ],
    bootstrap: [AppComponent, HttpClient]
  </code></pre>
  
  <p>I never seen this error.Is it an Angular 9 issue? Am I doing something wrong?</p>