While setting up postorius, i am getting the following error during this step sudo python setup.py develop as given in the link : http://pythonhosted.org/mailman/src/mailman/docs/WebUIin5.html

Processing mocker-1.1.1.tar.bz2 error: Not a recognized archive type: /tmp/easy_install-xxvsrr/mocker-1.1.1.tar.bz2