title: Flutter: XCode error "Unable to boot the Simulator"
body: <p>Iam running the latest OSX/Flutter/XCode Versions using flutter, android studio and firebase and 1 hour ago everthing works perfectly.</p>
  <p>Then i rebooted my macbook and when i try to launch an ios simulator i get this error &quot;Unable to boot the simulator&quot;.</p>
  <p>The following steps shows no solution:</p>
  <ol>
  <li>Reinstall the ios simulator</li>
  <li>Flutter clean and pub get</li>
  <li>Updating comand line tools 13.3.1 (13E500a)</li>
  <li>Run invalid cache of android studio</li>
  </ol>
  <p>I found the problem also on stackoverflow but all sugestions does not working.</p>
  <p>Any ideas?</p>
  <p>Let me know if you need more information!
  Thank you</p>