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