title: Uncaught (in promise) TypeError: object is not a constructor(…) in ionic2
body: <p>While using ionic2 running basic app also it's giving error like this: <strong>Uncaught (in promise) TypeError: object is not a constructor(…)</strong> in ionic2.</p>
  
  <hr>
  
  <p>create new app: ionic start appname tutorial --v2</p>
  
  <p>running app: ionic serve</p>
  
  <p>My system Specifications:</p>
  
  <p>Ubuntu :14.04 (64bit)</p>
  
  <p>Chrome :Version 49.0.2623.87 (64-bit)</p>
  
  <p>Node : v5.6.0</p>
  
  <p>npm : v3.6.0</p>
  
  <p><a href="https://i.stack.imgur.com/d7VlZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/d7VlZ.png" alt="enter image description here"></a></p>