Fix the "Error: Cannot retrieve repository metadata (repomd.xml) for repository:"

To fix this the path of your baseurl in the yum repository config file should have the repodata/ directory under it.

[epel-repo]
name=EPEL REPOSITORY
baseurl=http://ftp.riken.jp/Linux/centos/6.6/os/x86_64/
enabled=1
gpgcheck=0