Angular2 - 'router-outlet' no es un elemento conocido

Creé rutas con caminos infantiles profundos. Añadí <router-outlet>a la AdminComponent componente que he envuelto en NgModule. Pero después de actualizar la página recibí este error:

'router-outlet' is not a known element

Tal vez ocurrió porque olvidé importar algún módulo a admin.module.ts

Por favor ayuda. Gracias.

app.routes.ts

export const routes: Routes = [
    {
        path: '',
        component: AppComponent,
        children: [
            {
                path: '',
                component: LoginComponent
            },
            {
                path: 'admin',
                component: AdminComponent
            },
            {
                path: 'user',
                component: UserComponent
            },
            {
                path: 'there',
                component: ThereComponent
            }
        ]
    }
]

app.module.ts

@NgModule({
    imports: [
        BrowserModule,
        AppRoutes,
        FormsModule,
        ReactiveFormsModule,
        HttpModule,
        RouterModule,
        TranslateModule.forRoot({
            provide: TranslateLoader,
            useFactory: (http: Http) => {
                return new TranslateStaticLoader(http, './src/assets/i18n', '.json')
            },
            deps: [Http]
        }),
        UserComponentModule,
        AdminComponentModule,
        LoginComponentModule,
        ThereComponentModule,
        DashboardComponentModule
    ],
    declarations: [
        AppComponent
    ],
    providers: [
        FormBuilder
    ],
    bootstrap: [AppComponent]
})

admin.component.ts y admin.module.ts

//  admin.component.ts
import {Component} from "@angular/core";

@Component({
    selector: 'admin',
    template: "<router-outlet></router-outlet>",
})

export class AdminComponent {
    constructor() {

    }
}

//  admin.module.ts
const ADMIN_DECLARATION = [
    AdminComponent
];

@NgModule({
    imports: [
        BrowserModule,
        TranslateModule,
        FormsModule,
        ReactiveFormsModule
    ],
    declarations: [
        ADMIN_DECLARATION
    ],
    exports: [
        ADMIN_DECLARATION
    ],
    providers: [
        TranslateService,
        FormBuilder
    ]
})

export class AdminComponentModule {

}

AdminComponentes parte del módulo interno AdminComponentModuley no lo ha importado :RouterModuleAdminComponentModule

//  admin.component.ts
import {Component} from "@angular/core";

@Component({
    selector: 'admin',
    template: "<router-outlet></router-outlet>",
})

export class AdminComponent {
    constructor() {

    }
}

//  admin.module.ts
const ADMIN_DECLARATION = [
    AdminComponent
];

@NgModule({
    imports: [
        BrowserModule,
        TranslateModule,
        RouterModule,
        FormsModule,
        ReactiveFormsModule
    ],
    declarations: [
        ADMIN_DECLARATION
    ],
    exports: [
        ADMIN_DECLARATION
    ],
    providers: [
        TranslateService,
        FormBuilder
    ]
})

export class AdminComponentModule {

}

no exportaste el RouterModule.

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})

Agregar este código

import { provideRoutes} from '@angular/router';

para usted app.module.ts

Trabajó para mi.

En su archivo app.module.ts

import { routing } from './app-routing.module';

//and then write within imports
@NgModule({
  declarations: [
    AppComponent,
    NavbarComponent
  ],
  imports: [
    BrowserModule,
    **routing**,
    EmployeeModule
  ],

Esto funciona para mi:

Agregue esquema [NO_ERRORS_SCHEMA]en AppModule.

import { NO_ERRORS_SCHEMA } from '@angular/core';

@NgModule({
  schemas : [NO_ERRORS_SCHEMA]  
})

app.module.ts

import { MyRoutingModule } from './MyRoutingModulePath';

  @NgModule({
  imports: [
    MyRoutingModule
  ])