title: I am getting Runtime Error when I update ionic2 project to ionic3 ?
body: <p><strong>Runtime Error</strong>
  Module build failed: Error: ENOENT: no such file or directory, open '/Users/.../src/constants/Strings.js.map' at Error (native)</p>
  
  <p>typescript": "2.3.4"</p>
  
  <p><strong>Ionic info</strong> </p>
  
  <p>global packages:</p>
  
  <pre><code>@ionic/cli-utils : 1.4.0
  Cordova CLI      : 7.0.1
  Ionic CLI        : 3.4.0
  </code></pre>
  
  <p>local packages:</p>
  
  <pre><code>@ionic/app-scripts              : 1.3.7
  @ionic/cli-plugin-cordova       : 1.4.0
  @ionic/cli-plugin-ionic-angular : 1.3.1
  Cordova Platforms               : android 6.2.3 ios 4.4.0
  Ionic Framework                 : ionic-angular 3.4.2
  </code></pre>
  
  <p>System:</p>
  
  <pre><code>Node       : v6.10.3
  OS         : macOS Sierra
  Xcode      : Xcode 8.3.2 Build version 8E2002
  ios-deploy : 1.9.1
  ios-sim    : 5.0.13
  npm        : 5.0.3
  </code></pre>