I had the same problem.. but uninstalling and emptying my trash did not solve my problem.
After debugging it the whole day.
Ive decided to use the extreme.. RESTART.
After uninstalling, I did a restart. (without xcode running)
Then I did a fresh install, then did another restart (without xcode running)
After restarting, I started xcode. AND ALL IS FINE! 🙂
Hope it helped some guys out there that had the same problem as me.
Regards,
Steve