title: Xcode bug after crash
body: <p>While I was creating a build to test on my iPhone xcode 8 crashed, when I re-opened xcode  all of a sudden this error came about from no where.</p>
  
  <blockquote>
    <p>Command /Applications/Xcode.app/Contents/Developer/usr/bin/ibtool failed with exit code 255. The tool may have crashed. Please file a bug report at <a href="http://bugreport.apple.com" rel="noreferrer">http://bugreport.apple.com</a> with the above output and attach any crash logs for ibtool, ibtoold, Xcode, and Interface Builder Cocoa Touch Tool created around the time of this failure. These logs can be found in ~/Library/Logs/DiagnosticReports or /Library/Logs/DiagnosticReports.</p>
  </blockquote>
  
  <p>Can any one tell me how to resolve this.</p>