This is used for installation of r1soft agent. Agent was installed on Centos 6. Centos 6 version is not supported anymore so you might have a valid url problem. To solve this issue use this link. https://support.plesk.com/hc/en-us/articles/360017922619-After-November-30th-2020-updating-system-packages-on-Plesk-server-with-CentOS-6-fails-Cannot-find-a-valid-baseurl-for-repo-base