Why does yum fail with an error that a repo is listed more than once?

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Release Found: Red Hat Enterprise Linux 5.2 running yum-rhn-plugin-0.5.3-6.el5_2.6.

Problem:

Running yum clean all results in an error similar to the following:

$ yum clean all
Loading "rhnplugin" plugin
Loading "security" plugin


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