When I create a new project in XCode 6.0.1, I got this error message: The file "exclude" doesn't exist

It seems to only impact the versioning of the files i.e. the generated stub files are not committed into github after the project is created.
What can cause this problem?
For me the issue was caused because I had previously created a project with the same name, and Xcode still had record of that.
To clear it out,
To add your repository (if it's not being tracked for some reason),
I usually get this error if I initialize an Xcode project with a git repository, delete it and try to recreate it with the same name (casing doens't appear to make it sufficiently 'different'). Turns out, "Well I'll just start over" can leave some issues as well.
Hope this helps.