2009/9/13 Robert G. (Doc) Savage <dsavage(a)peaknet.net>
One klugey but effective way I've found to eliminate this error
is to rename /etc/yum.repos.d/Fedora-install-media.repo to .save.
File a bug against PackageKit in bugzilla, but first make sure you've
updated PackageKit and gnome-packagekit, and rebooted.