Fork of Pieter's nice git GUI for OS X. Includes branch/tag sidebar and various fixes. Current development focus is on removing legacy git command line usage in favour of libgit2 and objective-git.
I faced with this error after added git-lfs to my repo. So now, when I'm trying add to staged changes any tracked by git-lfs media file I see the same error.
I just got this error after updating on OS X 10.11.4 (15E65)