I have an issue where Xcode will not launch. The blue light shows under the icon, but nothing else seems to happen. I've already grabbed the latest version from the App Store and reinstalled, didn't fix the issue. Please help.

Log shows the following (two lines only, edited for easier reading):

Jan 19 22:11:15 Jason-McClurgs-MacBook-Pro Xcode[2089]: Unable to find either a
    loadable database or a Nodes.xml configuration file
Jan 19 22:11:15 Jason-McClurgs-MacBook-Pro Xcode[2089]: Error loading docSet 
     Error Domain=com.apple.DADocSetAccess Code=12 "Documentation set could not be read."
     UserInfo=0x400ac5340 {NSLocalizedDescription=Documentation set could not be read.,
     NSLocalizedFailureReason=Unable to find the database or 'Nodes.xml' configuration file.}
  • you are not the only one stackoverflow.com/questions/8877368/…
    – Stu Wilson
    Jan 19, 2012 at 12:05
  • Have you tried deleting the contents of the~/Library/Developer folder? The downloaded documentation mentioned in your error message is stored in this folder. Aug 12, 2012 at 11:00

1 Answer 1


It doesn't explain the root cause, but I did get the app to run, by creating a new account and starting the app under that account.

  • Did you create a new user account on your Mac, or a new App Store account? Aug 12, 2012 at 10:58
  • 1
    A new account on my Mac Mar 20, 2013 at 4:57

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