I'm having similar problems. I'm in the middle of a class with hard deadlines and don't have time to deal with a buggy IDE. Tried VisualStudio, but that doesn't work well, either. Hoping Apple Engineers will chime and provide answers. Security & Privacy settings for Xcode show access to volumes. Build settings appear to be correct. Please help. The other error seen conjunctive with this problem is an intermittent permission to edit the project files.