I get this error in Android Studio:
<Can\'t start Git: /usr/bin/git Probably the path to Git executable is not valid.
I have this issue when having two Xcode (ver.7 and ver.8) apps installed in my Mac OS Sierra.
What I do is simply open the Xcode 8, go to Preferences, select Locations in tab, and set the Command Lines Tools to Xcode 8.0.
I had the same problem in PhpStorm. This came to me after updating XCode on OS X EL Capitan. After this update I didn't open it to accept the license that was necessary for XCode and OS X. When I had accept the license the problem was resolved.