[Yum] a problem with yum update

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Hi,
     After install yum-2.2.0-1.noarch.rpm on  my RHEL 3.0 AS,
I type the command as follow:

# yum update

I got the message as follow:

Traceback (most recent call last):
  File "/usr/bin/yum", line 6, in ?
    import yummain
  File "/usr/share/yum-cli/yummain.py", line 23, in ?
    import yum
ImportError: No module named yum

what should I do to get rid of this problem?

------------------------------------------------------------
Robert Lee

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