运行时错误无法找到模块＆＃34; angular＆＃34;

Question

我正在Ionic 3（最新版本）中练习应用程序开发，并收到如下错误：

  

运行时错误无法找到模块＆＃34; angular＆＃34;

app.module.ts

.image-grid {
  width: 100%;
  padding-right: 30px;
  padding-left: 30px;
}

.image__cell {
  float: left;
  position: relative;
}

.basic__img {
  height: 200px;
  max-width: 100%;
  float: left;
  overflow: hidden;
}

.image__cell.is-collapsed {
  overflow: hidden;
  padding: 0.6%;
}

.image__cell.is-collapsed .image--basic {
  cursor: pointer;
}

.image--expand {
  position: relative;
  left: -5px;
  padding: 0 5px;
  box-sizing: content-box;
  overflow: hidden;
  background-color: #222;
  max-height: 0;
  transition: max-height .3s ease-in-out,margin-bottom .1s .2s;
}

.expand__close {
  position: absolute;
  top: 10px;
  right: 20px;
  color: #454545;
  font-size: 50px;
  line-height: 50px;
  text-decoration: none;
}

.expand__close:before {
  content: '×';
}

.expand__close:hover {
  color: #fff;
}

.image--large {
  max-width: 100%;
  height: auto;
  display: block;
  padding: 40px;
  margin: 0 auto;
  box-sizing: border-box;
}

app.component.ts

import { BrowserModule } from '@angular/platform-browser';
import { ErrorHandler, NgModule } from '@angular/core';
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular';
import { SplashScreen } from '@ionic-native/splash-screen';
import { StatusBar } from '@ionic-native/status-bar';

import {AngularFireModule} from 'angularfire2';

import { MyApp } from './app.component';
import { ShoppingListPage } from '../pages/shopping-list/shopping-list';
import { FIREBASE_CREDENTIALS } from './firebase.credentials';

@NgModule({ 
  declarations: [
    MyApp,
    ShoppingListPage
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(MyApp),

    //Initialize AngularFire with credentials from the dashboard
    AngularFireModule.initializeApp(FIREBASE_CREDENTIALS)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    ShoppingListPage
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler}
  ]
})
export class AppModule {}

购物-list.ts

import { Component } from '@angular/core';
import { Platform } from 'ionic-angular';
import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';


@Component({
  templateUrl: 'app.html'
})
export class MyApp {
  rootPage:any = 'ShoppingListPage';

  constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen) {
    platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      statusBar.styleDefault();
      splashScreen.hide();
    });
  }
}