我的fedora升级出错，之后提示下面的内容，请高手帮助！

mamahuhu365

Upgrading all packages with command yum -y update ..

There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   libxml2.so.2: cannot open shared object file: No such file or directory

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.5.1 (r251:54863, Oct 30 2007, 13:54:11)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-33)]

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://wiki.linux.duke.edu/YumFaq
  


.. upgrade failed!