title: the development server returned response error code 500 - react native - ./configs/main
body: <p>I got this error when i tried to make <code>hello-world</code> sample:<br>
  <code>react-native init hello_world
  cd hello_world
  react-native run-android</code></p>
  
  <p>Even when I ran:<br>
  <code>npm install -g react-native-git-upgrade
  react-native-git-upgrade</code><br>
  I got same error on <code>commend line console</code>.
  <a href="https://i.stack.imgur.com/7emeB.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7emeB.jpg" alt="enter image description here"></a></p>
  
  <p>I've searched and tried many solutions but it doesn't seem to work:
  Example:<br>
  * <code>upgrade react-native</code><br>
  * using watchman <code>watchman watch-del-all</code><br>
  * remove <code>node_modules</code><br>
  * clean cache <code>npm cache clean</code>or <code>npm start -- --reset-cache</code></p>
  
  <p>Operation: Window 8<br>
  react-native-cli: 2.0.1<br>
  react-native: 0.44.2 ( tried 0.47.1 too )<br>
  Android: Simulator Nexus5X  </p>
  
  <p>Thank you all in advance!</p>