Fatal error: Uncaught Error: Class "MediaWiki\Extension\Notifications\Formatters\EchoPresentationModelSection" not found in /var/www/html/extensions/DiscussionTools/includes/Notifications/PlaintextEchoPresentationModelSection.php:23 Stack trace: #0 {main} thrown in /var/www/html/extensions/DiscussionTools/includes/Notifications/PlaintextEchoPresentationModelSection.php on line 23