title: Error: Cannot find module "@ionic/angular"
body: <p>i'm trying to implement ion2-calendar from 
  <a href="https://github.com/hsuanxyz/ion2-calendar" rel="nofollow noreferrer">https://github.com/hsuanxyz/ion2-calendar</a></p>
  
  <p>but when i trying to imported to my app.module.ts</p>
  
  <p>i get this error : </p>
  
  <pre><code>Uncaught Error: Cannot find module "@ionic/angular"
  at webpackMissingModule (calendar.modal.js:13)
  at Object.&lt;anonymous&gt; (calendar.modal.js:13)
  at __webpack_require__ (bootstrap ff18038c92faa82fd673:54)
  at Object.&lt;anonymous&gt; (index.js:7)
  at __webpack_require__ (bootstrap ff18038c92faa82fd673:54)
  at Object.355 (main.ts:5)
  at __webpack_require__ (bootstrap ff18038c92faa82fd673:54)
  at Object.332 (main.ts:1)
  at __webpack_require__ (bootstrap ff18038c92faa82fd673:54)
  at webpackJsonpCallback (bootstrap ff18038c92faa82fd673:25)
  </code></pre>
  
  <p>my app.module.ts</p>
  
  <pre><code>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 { MyApp } from './app.component';
  import { HomePage } from '../pages/home/home';
  import { Http, Headers, RequestOptions, HttpModule } from '@angular/http';
  import { CalendarModule } from 'ion2-calendar';
  
  
  @NgModule({
  declarations: [
  MyApp,
  HomePage
  ],
  imports: [
  BrowserModule,HttpModule,
  IonicModule.forRoot(MyApp),
  CalendarModule
  ],
  bootstrap: [IonicApp],
  entryComponents: [
  MyApp,
  HomePage
  ],
  providers: [
  StatusBar,
  SplashScreen,
  {provide: ErrorHandler, useClass: IonicErrorHandler}
  ]
  })
  export class AppModule {}
  </code></pre>
  
  <p>don't know what's wrong</p>