title: Got an error that is "Uncaught (in promise) TypeError: object is not a constructor(…)"
body: <p>When open the app on browser using "ionic serve" command, I get below error, could please help to check? Thanks!</p>
  
  <p>Please refer to my codes in <a href="https://github.com/aaronchen2k/mobistore-client/tree/master/app" rel="nofollow">https://github.com/aaronchen2k/mobistore-client/tree/master/app</a></p>