Hello Rudi,
I got this error after updating ipgeo plugin:
Fatal error: require_once(): Failed opening required '/home/00000/domains/0000.com/public_html/plugins/ipgeo/vendor/autoload.php' (include_path='.:/opt/alt/php74/usr/share/pear') in /home/00000/domains/0000.com/public_html/plugins/ipgeo/rlIPGeo.class.php on line 75
I've fixed it by return the old file rlIPGeo.class.php
