Hello John,
thanks for your prompt reply. I tried disabling all the plugins and the error is still there. It happens every time a user visit the page. It seems that when the page is loaded (client side) the plugin checks for updates and the error is written in the log. But the feed gets updated anyway.
I’m running the server (centos with parallel plesk, about 200 sites on it hosted on a structure we have in OVH), standard configuration I would say, no issues in more than one year.
If you need more info just let me know.
Thank you
Bulfa