Textmate probably can't find your git binary. Is the correct path set in the preferences? Can you perform git actions within Textmate with a right click or Ctrl-Cmd-G?
vv
On a slightly unrelated topic, am I the only one not seeing the GIT status indicators (using Project+, git is enabled on the SCM pane)? SVN indicators show just fine, wondering what's wrong ... any hint? git version 1.7.4.4 TM version 1.5.10 (1631)
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