yum problem, 'Repository base already added' (FC3)

[Duncan Lithgow]

I'm getting the output below from yum, being new to this it doesn't make 
sense to me - otherwise I'd try and look it up. Could someone explain 
what this message means? If you want to help me fix it that'd be a bonus.

[root at 3e6b3480 dulithgow]# yum list
Repository updates-released already added, not adding again
Repository base already added, not adding again
Setting up Repo:  livna-stable
Cannot open/read repomd.xml file for repository: livna-stable
failure: repodata/repomd.xml from livna-stable: [Errno 256] No more 
mirrors to try.
[root at 3e6b3480 dulithgow]#