[CentOS] Can't find repository for centosplus [SOLVED]

>OK .. .you have stuff repeated in yum.conf that doesn't need to be there...
>  
>
Thanks! This worked perfectly.
However, I'm curious. Why did having all those other listings of 
repositories cause the problem? Before, when I was trying to install 
Xine, I ended up having to put all of them in there for it to work.

Dave