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Description of problem:
I try to update RHES3.6 to RHAS 4.2.

So I try :
up2date --upgrade-to-release=4AS

rpms installing. But, I always have the following error (always, with up2date command ): 
 
Traceback (most recent call last):
  File "/usr/sbin/up2date", line 27, in ?
    from up2date_client import repoDirector
  File "/usr/share/rhn/up2date_client/repoDirector.py", line 5, in ?
    import rhnChannel
  File "/usr/share/rhn/up2date_client/rhnChannel.py", line 10, in ?
    import up2dateAuth
  File "/usr/share/rhn/up2date_client/up2dateAuth.py", line 5, in ?
    import rpcServer
  File "/usr/share/rhn/up2date_client/rpcServer.py", line 23, in ?
    from rhn import rpclib
ImportError: No module named rhn


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.up2date --upgrade-to-release=4AS
2.
3.
  

Additional info: