Error issuing curl_easy_perform(handle): 7 AND XML: errors

Server Version#: 1.20.3.3483
Premium User.

I installed PLEX on my QNAP NAS only with a lot of music on it

I get repeating errors and don’t know the reason.
see screendumps

I can’t find the answer in other topics.
How do I get rid of these errors piling up in the PLEX console