install savanna error

I have installed the savanna-stable-0.1 version

now i want to try the version 0.2, I have downlaod the source code savanna-0.2.tar.gz from the website

after unpacking this tar, I try to install it using the same method as i installed the version 0.1

python setup.py install

but some excepitons are thrown as follows:

Traceback (most recent call last):
  File "setup.py", line 26, in <module>
    version=common_setup.get_version(project, '0.2'),
  File "/root/zjf/savanna-0.2/savanna/openstack/common/setup.py", line 368, in get_version
    raise Exception("Versioning for this project requires either an sdist"
Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository.

how should I do ?