Yesterday I installed the official Xcode 7 and when I tried to open one of my Swift projects, appeared an alert saying that the new Xcode version wants to update my swift co
I had the same error in my project after upgrading to xCode 7. I decided to remove the new version of xCode and install xCode 6.4. After all, it worked fine using xCode 6.4, so i suggest you do that to start with. On other hands, you should always be up to date, but you can also have both xCode 6.4 and 7.0 :) Hope this works out for you!