I apologize for posting that too quickly, I fixed that issue due to formatting from the copy and paste.
The issue is now "failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
http://mirror.centos.org/centos/7Server/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found"
Any suggestions? Thanks so much for your help.