Problem with Yum

When I run yum I get the following error.

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

   /usr/lib64/libnssutil3.so: undefined symbol: PL_ClearArenaPool

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:
2.4.3 (#1, Jun 11 2009, 14:09:37)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)]

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


Is this a know issue? Can anyone tell me how to resolve it?


Regards,
Denis Patterson