Fatal error: Uncaught Error: Class "MediaWiki\Api\ApiBase" not found in C:\xampp\htdocs\extensions\DiscussionTools\includes\ApiDiscussionToolsPageInfo.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\DiscussionTools\includes\ApiDiscussionToolsPageInfo.php on line 22