Fatal error: Uncaught Error: Class "ApiBase" not found in /var/www/html/orian-wiki/extensions/DiscussionTools/includes/ApiDiscussionToolsPreview.php:16 Stack trace: #0 {main} thrown in /var/www/html/orian-wiki/extensions/DiscussionTools/includes/ApiDiscussionToolsPreview.php on line 16