I'm also experiencing this exact same problem. Unfortunately, the fix suggested still results in the same error message on launching Xcode 4. I created a new admin account, completely uninstalled Xcode, shut down and restarted, opened the new admin account and reinstalled Xcode in the way described. myrepospace, did you find the above fix successful, and if not have you found another solution? Any feedback/suggestions from anybody would be greatly appreciated.