Accept Merge request is not working

Hi There,

After our upgrade to latest gitlab 7.12.2 accept merge is not working. Below is what we see in log

Below is what i see in the error log.

July 20, 2015 08:42 -> ERROR -> Command failed [128]: /opt/gitlab/git/bin/git --git-dir=/srv/git/gitlab-satellites/Traininggroup/Trainingproj/.git --work-tree=/srv/git/gitlab-satellites/Traininggroup/Trainingproj push origin release
git: '/srv/git/Traininggroup/Trainingproj.git' is not a git command. See 'git --help'.
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.