Fatal error: Uncaught Error: Class "MediaWiki\SpecialPage\FormSpecialPage" not found in /var/www/html/extensions/DiscussionTools/includes/SpecialDiscussionToolsDebug.php:21 Stack trace: #0 {main} thrown in /var/www/html/extensions/DiscussionTools/includes/SpecialDiscussionToolsDebug.php on line 21