Rails 3.1.rc4 with compass (git rev-parse HEAD (Errno::ENOENT))

After upgrading to OSX Lion, there is a error in the terminal with every rails command.

/Us开发者_如何学JAVAers/danielpuglisi/.rvm/gems/ruby-1.9.2-p0@rails31/bundler/gems/compass-2124003550bf/lib/compass/version.rb:44:in ``': No such file or directory - git rev-parse HEAD (Errno::ENOENT)