问AngularFire - Firebase - call Firebase App.initializeApp() (app/no-app)

EN

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';


// AngularFire and Firestore
import { AngularFireModule } from 'angularfire2';
import { AngularFirestoreModule } from 'angularfire2/firestore';

// Routing
import { AppRouting } from './routing/app-routing';

// Environment
import { environment } from '../environments/environment';

// Components
import { LoginModule } from './login/login.module';


 @NgModule({
  declarations: [
  AppComponent
 ],
 imports: [
  BrowserModule,
  AngularFireModule.initializeApp(environment.firebase), 
  AngularFirestoreModule,
  AppRouting,
  LoginModule
 ],
 providers: [],
 bootstrap: [AppComponent]
})
export class AppModule { }

import * as firebase from 'firebase';

...

createAccount(){
 firebase.auth().createUserWithEmailAndPassword(this.email, this.password).catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  console.log(errorCode + ' / ' + errorMessage);
  // ...
 });
}