Red hat / Fedora / CentOS Yum Repo is Listed More Than Once

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Q. Why does my yum command fail with an error that a repo is listed more than once under Fedora / RHEL / CentOS Linux? This error occurs when I type yum clean command

Loading “rhnplugin” plugin
Loading “security” plugin

Repository xen-repo is listed more than once in the configuration

How do I fix this problem?

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