Occasionally getting couldn't set refs/remotes/origin/master
In theme-for-site-data
Problem when git pushing (not every time)
error: Couldn't set refs/remotes/origin/master error: update_ref failed for ref 'refs/remotes/origin/master': Cannot update the ref 'refs/remotes/origin/master'.
The Stack Overflow article we looked at: http://stackoverflow.com/questions/23749886/git-unable-to-resolve-references-when-pushing