Fatal error: Uncaught Error: Class "MediaWiki\SpecialPage\SpecialPage" not found in C:\xampp\htdocs\extensions\DiscussionTools\includes\SpecialTopicSubscriptions.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\DiscussionTools\includes\SpecialTopicSubscriptions.php on line 11