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User-Agent: Mozilla/5.0 (compatible; Konqueror/3.3; Linux) (KHTML, like Gecko)

Description of problem:
# yum check-update
Traceback (most recent call last):
  File "/usr/share/yum/yummain.py", line 135, in ?
    main(sys.argv[1:])
  File "/usr/share/yum/yummain.py", line 62, in main
    result, resultmsgs = base.doCommands()
TypeError: unpack non-sequence

The same command with the same libraries etc installed but an older version of yum works perfectly.

Version-Release number of selected component (if applicable):
2.1.0-1

How reproducible:
Always

Steps to Reproduce:
run yum

Additional info: