How to use the angular2-toaster/angular2-toaster.ToasterModule.forRoot function in angular2-toaster

import { routing } from './app.routing';
import { AppService } from './app.service';
import { ServicesModule } from './service/services.module';
import { SharedModule } from './shared/shared.module';
import { NavbarModule } from './views/navbar/navbar.module';

let ngModule: NgModule = {
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        HttpClientModule,
        NavbarModule,
        ToasterModule.forRoot(),
        SharedModule,
        ServicesModule.forRoot(),
        routing,
        TranslateModule.forRoot({
            loader: {
                provide: TranslateLoader,
                useFactory: createTranslateLoader,
                deps: [HttpClient]
            }
        }),
    ],
    exports: [
        ServicesModule,
    ],
    providers: [
        AppService,