@vanyukov
Thanks, it actually was the advanced-cache.php that was the culprit. However, the plugin originally was only ever installed and deinstalled through the plugin backend in wordpress.
Thanks at all for the quick help!
cheers
Getting same error after update 5.3.2 – funny enough i dont even have the plugin installed anymore… why the hell am i getting this error message when the plugin folder is long gone??
