yum repomd.xml error message

[Benjamin Sher <delphi123 zebra net>]

Dear friends:

What is this error message from the Dag repository all about, please? 
How do I correct it?

[sher localhost ~]$ yum list available |more
Cannot open/read repomd.xml file for repository: dag
Cannot find repomd.xml file for dag
Setting up Repos
[sher localhost ~]$

Thank you.

Benjamin