title: XMLHttpRequest error in ReactNative Debug mode
body: <p>I delete my android emulator and create a new one after this when i build my react native project and active <strong>debug</strong> mode this error appears on emulator but i dont have any problems with Previous emulator :</p>
  
  <p><code>Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'http://localhost:8083/create_session'.</code></p>
  
  <p>and this on browser's console :</p>
  
  <p><code>Must first create RPC session with a valid host</code></p>
  
  <p>what should i do?</p>