some problem with TRAC 0.12 and GIT 1.7.10.2 (Apple Git-33)

[anonymous]

When I want to set up TRAC with GIT on my Mac OS X 10.8 sever, I used TRAC 0.12, GIT 1.7.10.2 (Apple Git-33) and install the plugin using "easy_install ​http://github.com/hvr/trac-git-plugin/tarball/master";

But when I started the TRAC sever, there's an error on the website, which is "Warning: Can't synchronize with repository "(default)" (GIT backend not available). Look in the Trac log for more information.".

So I checked the log and find this error "Trac[git_fs] ERROR: GitError: Could not retrieve GIT version (tried to execute/parse '/usr/bin/git --version' but got ValueError('too many values to unpack',))"

Does anyone have some kind of solutions to this problem?

Thanks a lot for helping me.