ionic2 - 无法解决所有参数错误

ionic2 - Cannot resolve all parameters error

我有以下 ts 代码。

#home.ts
import {Page, NavController} from 'ionic-framework/ionic';

@Page({
  templateUrl: 'build/pages/home/home.html'
})
export class HomePage {
  constructor(nav: NavController){
  }
}

我收到以下错误。

Error: Cannot resolve all parameters for 'HomePage'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'HomePage' is decorated with Injectable.
    at NoAnnotationError.BaseException [as constructor] 

我看过 FAQ, ionic NavController example and the documentation。但我无法发现它为什么抱怨的错误。对我来说,我似乎正确地导入了所有内容。

我可能做错了什么?

以下是我的系统信息

Your system information:

Cordova CLI: 5.4.1
Gulp version:  CLI version 3.9.0
Gulp local:  
Ionic Version: 2.0.0-beta.1
Ionic CLI Version: 2.0.0-beta.17
Ionic App Lib Version: 2.0.0-beta.8
ios-deploy version: Not installed
ios-sim version: 5.0.2 
OS: Mac OS X El Capitan
Node Version: v4.1.1
Xcode version: Xcode 7.0.1 Build version 7A1001 

试试:

constructor(@Inject(NavController) nav:NavController)