Fatal error: Uncaught Error: Class "MediaWiki\Extension\AbuseFilter\Filter\ExistingFilter" not found in C:\xampp\htdocs\extensions\AbuseFilter\includes\Filter\HistoryFilter.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\AbuseFilter\includes\Filter\HistoryFilter.php on line 8