adding apps problem

[Robert Holtzman]

Just loaded FC9 as a dual boot with ubuntu. went to check for more apps:

System -> Administration -> Add/Remove Software
selected a group

"The group was not found
comps categories could not be loaded"

/etc/yum.repos.d contains fedora.repo, fedora-rawhide.repo,
fedora-updates.repo and fedora-updates-testing.repo

Any ideas, help, pointers, docs, web sites or anything else Where I can 
get some information?

Thanks in advance.

-- 
Bob Holtzman
"If you think you're getting free lunch,
  check the price of the beer"