Then I try to use the program from here https://bitbucket.org/eugeneai/linux-project.git, Python returns this message:

Traceback (most recent call last):
File "/home/alex/convert.py", line 22, in
print i, comm.message.strip(), comm.committer
File "/usr/local/lib/python2.7/dist-packages/gitdb/util.py", line 238, in __ getattr __
self.set_cache(attr)