The working copy '<Project Name>' failed to commit files - Couldnt communicate with helper application

Turns out the “helper application” is in fact Git. For some reason Xcode 7 is eager to associate you (the committer) with a name and an email address.

To fix it, on the command line, type the following:

xcrun git config --global user.email [email protected]
xcrun git config --global user.name "Your Name Here"

If the above mentioned solutions don't work, try this one:

Add changes once with a git command. Use terminal and change to your working directory (that contains a /.git folder) and execute:

git commit -a -m "Commit title here"

After that commit via Xcode should work again.

I had the same problem.

This fixed my problem: Quit Xcode(using CMD+Q) & run it again.