There seems to be a bug in Xcode 7 that you may or may not encounter: when creating a new project with the Git repository, Xcode 7 may cause it to “fail to communicate with the helper application”. The same error can tell you that it "cannot transfer files."
This happened to me after upgrading from Xcode 6.x, which Ive never had this problem with.
It turns out that the “helper application” is actually Git: for some reason, Xcode 7 wants to associate you (the committer) with a name and email address. Xcode even offers access to Mac contacts on first launch.
To fix this, all we need to do is launch our reliable Terminal application (command line tool) and tell Xcode who we are, and these errors are a thing of the past. The good news is that this should happen only once. Here's how to do it:
At the command prompt, enter the following:
xcrun git config --global user.email you@yourdomain.com xcrun git config --global user.name "Your Name Here"
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