SUSE 11 SP2上安装FOLSOM，执行keystone提示如下错误，有大侠知道什么原因？

linux:~ # keystone
Traceback (most recent call last):
  File "/usr/bin/keystone", line 5, in
    from pkg_resources import load_entry_point
  File "/usr/lib64/python2.6/site-packages/pkg_resources.py", line 2807, in
    working_set.require(__requires__)
  File "/usr/lib64/python2.6/site-packages/pkg_resources.py", line 690, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib64/python2.6/site-packages/pkg_resources.py", line 588, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: requests>=0.8.8,
    from pkg_resources import load_entry_point
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 2603, in
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 666, in require
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 565, in resolve
pkg_resources.DistributionNotFound: python-keystoneclient==0.2.2
但实际上python-keystoneclient已经安装了
如果将Python版本切换会2.6，就没有这个提示了，但是由于keystone对Python的要求必须是2.6.8以上，否则后续的功能有问题，因此必须对python版本进行升级。
        

            先升级Python 再安装，keystone，实在不行就源代码安装吧
        

            怎么感觉包或者组件有问题那