title: Xcode Storyboard file was broken suddenly
body: <p>My Xcode is 10.1 and has been used for over 6 months. Before upgrading Security-Updates-2009-001 from App Store in MacOS X High Sierra 10.13.6, my Xcode quitted frequently and accidentally. Today, after upgrading the security path, it finally broke my Xcode and my Storyboard in projects suddenly as the images below.</p>
  
  <p><a href="https://i.stack.imgur.com/cBNvb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cBNvb.png" alt="enter image description here"></a></p>
  
  <p>It doesn't work even I checkout my Git to previous versions. It seems that the Xcode was something wrong inside, and so does my Simulators. The Xcode cannot launch any Simulators at all and always shows "Unable to boot simulator", no matter I launch it from Scheme Building or Launchpad.</p>
  
  <p>I have been testing all solutions on boards to try to recover my Simulators and Storyboards, but it doesn't work. Does anyone can give me more assistance to solve it?</p>
  
  <p><a href="https://i.stack.imgur.com/RIvXW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RIvXW.png" alt="enter image description here"></a></p>
  
  <blockquote>
    <p>Unable to boot the Simulator.</p>
  </blockquote>
  
  <p>The broken Storyboard looks like this one.. and the Log text file shows </p>
  
  <blockquote>
    <p>Encountered an error communicating with IBAgent-iOS. (Failure reason: IBAgent-iOS failed to launch): Failed to boot device iPhone 8 (E28478CE-81DC-4B16-A12E-16AA7086BE31, iOS 12.0, Shutdown) for context ...... The folder “disabled.plist” doesn’t exist. (Failure reason: The folder doesn’t exist.): The operation couldn’t be completed. No such file or directory (Failure reason: No such file or directory).....</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/ANiAQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ANiAQ.png" alt="enter image description here"></a></p>
  
  <p>and it is useless to uninstall and re-install Xcode again and again from 10.1 to 10.0 and to 10.1 again</p>