The one named " Fedora Core 2 - x86_64 - Base " in your config file.
what exactly does blabla mean? there are several directories:
base freshrpms livna-testing updates-released dag livna-stable livna-unstable
It's "base", which is faulty somewhere in your config, the cache or the server.
Btw, when you use livna-* repositories, you must activate fedora.us for x86_64, too, since rpm.livna.org depends on fedora.us.