yast software repos

I am at 15.5 fixing to upgrade to 15.6. But I think I need to fix the below error first. I get this when in yast2 I click on "Yast Software Repositories". Errors occurred while restoring the repository configuration. Error refreshing service openSUSE (dir:/usr/share/zypp/local/service/openSUSE): [openSUSE:repo-oss|http://cdn.opensuse.org/distribution/leap/15.5/repo/oss] Repository already exists. Regards Mark