Python/up2date error on RHEL4

[Dayton Jones]

I'm trying to run up2date and keep getting:

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
File "/usr/lib/python2.3/site-packages/rhn/__init__.py", line 11, in ?
import rpclib
File "/usr/lib/python2.3/site-packages/rhn/rpclib.py", line 14, in ?
import transports
File "/usr/lib/python2.3/site-packages/rhn/transports.py", line 24, in ?
import connections
File "/usr/lib/python2.3/site-packages/rhn/connections.py", line 14, in ?
import SSL
File "/usr/lib/python2.3/site-packages/rhn/SSL.py", line 15, in ?
from OpenSSL import SSL, crypto
File "/usr/lib/python2.3/site-packages/OpenSSL/__init__.py", line 11,
in ?
import rand, crypto, SSL, tsafe
File "/usr/lib/python2.3/site-packages/OpenSSL/tsafe.py", line 5, in ?
import threading
File "/usr/lib/python2.3/threading.py", line 11, in ?
from StringIO import StringIO as _StringIO
ValueError: bad marshal data


When trying to launch the rhn-applet I get:

Traceback (most recent call last):
File "/usr/bin/rhn-applet-gui", line 30, in ?
import rhn_applet
File "/usr/share/rhn/rhn_applet/rhn_applet.py", line 31, in ?
from StringIO import StringIO
ValueError: bad marshal data



What exactly is "bad marshal data" How can I resolve this?

Red Hat Enterprise Linux ES release 4 (Nahant Update 2)


Thanks in advance