ASSERTION ERROR: Type passed in is not ComponentType, it does not have 'ɵcmp' property

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..

So these are the main routes (appModule):

const routes: Routes = [
{path:'home', component:HomeComponent, canActivate:[AuthGuardService]},
{path:'detail/:id', componentetailComponent},
{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 { }


I have a core module where all the components are registed, and i'm importing the RouterModule.forChild([]):

@NgModule({
declarations: [HomeComponent, DetailComponent, RegisterComponent, LoginComponent],
imports: [
CommonModule,
FormsModule,
ReactiveFormsModule,
RouterModule.forChild([])
]
})
export class CoreModule { }


The package.json:

{
"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"
}
}


EDIT appModule

@NgModule({
declarations: [
AppComponent,
],
imports: [
BrowserModule,
HttpClientModule,
BrowserAnimationsModule,
CoreModule,
NgbModule

],
providers: [DataService, fakeBackendProvider, AuthService, AuthGuardService, ShoppingCartService ],
bootstrap: [AppComponent, HttpClient]


I never seen this error.Is it an Angular 9 issue? Am I doing something wrong?

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