Another problem when using Livna.org yum updates

[Beartooth]

yum keeps aborting, and I keep getting a message saying to run yum clean
or remove some file, plus another saying Error: You may also check that
you have the correct GPG keys installed.

How do I do the latter? Fwiw, I got whatever it is that I have by doing

rpm --import http://www.fedoralegacy.org/FEDORA-LEGACY-GPG-KEY

(I'm running FC1)
-- 
Beartooth Autodidact, curmudgeonly codger learning linux
Remember I know precious little of what I'm talking about!