title: Cannot read property 'call' of undefined when making a change
body: <ul>
  <li>Ionic Framework: 3.4.2</li>
  <li>Ionic Native: ^2.9.0</li>
  <li>Ionic App Scripts: 2.1.3</li>
  <li>Angular Core: 4.1.3</li>
  <li>Angular Compiler CLI: 4.1.3</li>
  <li>Node: 6.11.0</li>
  <li>OS Platform: Windows 10</li>
  <li>Navigator Platform: Win32</li>
  <li>User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36</li>
  </ul>
  
  <p>everything was working just fine until i install ionic-native, every time i make a change it shows me this error.</p>
  
  <p><code>Runtime Error
  Cannot read property 'call' of undefined</code></p>
  
  <p>so i need to re-run ionic serve everytime i make a change </p>