[Pharo-users] Problem with gitfiletree in pharo 5

Today I tried to use a pharo 5 image for my project. I installed gitfiletree but could not access my existing git repo I use with pharo 4. In MCFileTreeGitRepository>>#gitBranchs the output for the git command is an empty string while executing the same on the console gives me * master Is this a OSProcess problem? Where to look at to find the culprit? thanks, Norbert