yum just died unexpectedly

Hi, I had yum working fine until a few moments ago when it began to give me a error message on every commman (yum clean or yum update etc...)

Traceback (most recent call last):
  File "/usr/bin/yum", line 60, in ?
    yummain.main(sys.argv[1:])
  File "yummain.py", line 188, in main
  File "clientStuff.py", line 766, in get_package_info_from_servers
  File "clientStuff.py", line 103, in HeaderInfoNevralLoad
ValueError: unpack list of wrong size

Any one knows why is this happening?

-- Juan Gabriel Florez <jgflorez@xxxxxxxxxxx>