مشکل در yum

[swith1996]

با سلام
من دستور yum رو که می زنم این ارور می یاد چطور درستش کنم

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

No module named yum

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:
2.3.7 (#1, Feb 27 2013, 1347)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-54)]

If you cannot solve this problem yourself, please go to
the yum faq at:
Faq - yum - Trac
http://yum.baseurl.org/wiki/Faq

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