http://repo.ajenti.org/ng/centos/18/x86_64/repodata/repomd.xml: [Errno 14] curl#22 - "The requested URL returned error: 404 Not Found"

Ever after running "sudo yum clean metadata", I am seeing this error:

http://repo.ajenti.org/ng/centos/18/x86_64/repodata/repomd.xml: [Errno 14] curl#22 - "The requested URL returned error: 404 Not Found"

Trying other mirror.

Error: failure: repodata/repomd.xml from ajenti: [Errno 256] No more mirrors to try.

http://repo.ajenti.org/ng/centos/18/x86_64/repodata/repomd.xml: [Errno 14] curl#22 - "The requested URL returned error: 404 Not Found"

Any thoughts?