Mine

http://mirror.centos.org/centos/4/contribs/i386/repodata/repomd.xml: [Errno 4] IOError: HTTP Error 404: Not Found
Trying other mirror.
Cannot open/read repomd.xml file for repository: addons
failure: repodata/repomd.xml from addons: [Errno 256] No more mirrors to try.