[root@server home]# yum update
Repository update is listed more than once in the configuration
Repository base is listed more than once in the configuration
Repository addons is listed more than once in the configuration
Setting up Update Process
Setting up repositories
update                    100% |=========================|  951 B    00:00
base                      100% |=========================| 1.1 kB    00:00
Cannot find a valid baseurl for repo: addons
Error: Cannot find a valid baseurl for repo: addons