title: nothing happens after react-native run-ios --device in react native
body: <p>running on my device used to work fine. However, suddenly,
  when I run react-native run-ios --device,
  I get to the ending like</p>
  
  <ul>
  <li>[[ true != true ]]</li>
  </ul>
  
  <p>** BUILD SUCCEEDED **</p>
  
  <p>installing and launching your app on User’s iPhone...</p>
  
  <p>However, nothing happens after and the app does not get installed in my device. </p>