Bug on Angular-CLI project

Build using ng serve or ng build: OK

Console Error:

app.module.ts Uncaught TypeError: Cannot read property ‘forRoot’ of undefined at app.module.ts

The only other module I import is ToastModule. I tested without it and the error still occurs.

Versions

ng --version angular-cli: 1.0.0-beta.24 node: 7.2.1 os: win32 x64 @angular/common: 2.4.5 @angular/compiler: 2.4.5 @angular/core: 2.4.5 @angular/forms: 2.4.5 @angular/http: 2.4.5 @angular/platform-browser: 2.4.5 @angular/platform-browser-dynamic: 2.4.5 @angular/router: 3.4.5 @angular/compiler-cli: 2.4.5

Steps

Install both ng2-bootstrap and bootstrap:

npm install --save ng2-bootstrap bootstrap

app.module.ts

...
import { ToastModule } from 'ng2-toastr/ng2-toastr';
import { AlertModule } from 'ng2-bootstrap';
...

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [    
    BrowserModule,
    FormsModule,
    ReactiveFormsModule,
    HttpModule,

    ToastModule,
    AlertModule.forRoot(),

    // Routing    
    RouterModule.forRoot(ROUTES, { useHash: false, preloadingStrategy: PreloadAllModules })
  ],
  providers: [ ],
  bootstrap: [AppComponent]