How to use the angular-bootstrap-md.ModalModule.forRoot function in angular-bootstrap-md

@NgModule({
  imports: [MatButtonModule, MatListModule,
    MatToolbarModule, MatSidenavModule,
    MatIconModule, MatFormFieldModule,
    MatCardModule, MatInputModule, MatBottomSheetModule,
    AlertModule, MatTableModule, MatGridListModule, MatExpansionModule,
    MatDialogModule, MatProgressBarModule, ModalModule, WavesModule, InputsModule, ButtonsModule,
    ModalModule.forRoot()],
  exports: [MatButtonModule, MatListModule, MatExpansionModule,
    MatToolbarModule, MatSidenavModule,
    MatIconModule, MatFormFieldModule, MatBottomSheetModule,
    MatCardModule, MatTableModule, MatInputModule, AlertModule, MatGridListModule,
    MatDialogModule, MatProgressBarModule, ModalModule, WavesModule, InputsModule, ButtonsModule,],
  declarations: []

})

export class MaterialModule { }

import { AuthModule } from './auth/auth.module';
import { AngularFireAuthModule } from '@angular/fire/auth';
import { HttpClientModule } from '@angular/common/http';
import { AngularFirestoreModule } from '@angular/fire/firestore';
import { AngularFireDatabaseModule } from '@angular/fire/database';
import { SharedModule } from './shared/shared.module';
import { AdminModule } from './admin/admin.module';
import { ModalModule } from 'angular-bootstrap-md';

@NgModule({
  declarations: [AppComponent],
  imports: [
    BrowserModule,
    AuthModule,
    SharedModule,
    ModalModule.forRoot(),
    AdminModule,
    AppRoutingModule,
    HttpClientModule,
    AngularFireModule.initializeApp(environment.firebase),
    AngularFireAuthModule,
    AngularFirestoreModule,
    AngularFireDatabaseModule,
    CoreModule,
    StoreModule.forRoot(reducers, {
      runtimeChecks: {
        strictStateImmutability: true,
        strictActionImmutability: true
      },
      metaReducers
    }),
    !environment.production ? StoreDevtoolsModule.instrument() : [],