Different yum/up2date problem

All was working fine yesterday...  Now, I get the following whenever I
try to yum or up2date using Fedora Core 1:

Using yum:
# yum update
Traceback (most recent call last):
  File "/usr/bin/yum", line 22, in ?
    import yummain
  File "yummain.py", line 21, in ?
  File "clientStuff.py", line 25, in ?
  File "pkgaction.py", line 25, in ?
  File "rpmUtils.py", line 9, in ?
  File "urlgrabber.py", line 21, in ?
  File "/usr/lib/python2.2/urllib2.py", line 101, in ?
    import ftplib
  File "/usr/lib/python2.2/ftplib.py", line 68, in ?
    all_errors = (Error, socket.error, IOError, EOFError)
AttributeError: 'module' object has no attribute 'error'

Using up2date:
# up2date
Traceback (most recent call last):
  File "/usr/sbin/up2date", line 22, in ?
    from up2date_client import repoDirector
  File "repoDirector.py", line 5, in ?
  File "rhnChannel.py", line 9, in ?
  File "up2dateAuth.py", line 5, in ?
  File "rpcServer.py", line 15, in ?
  File "/usr/lib/python2.2/socket.py", line 41, in ?
    from _socket import *
ImportError: /lib/libssl.so.4: undefined symbol: krb5_cc_get_principal