Fatal error: Uncaught Error: Class "MediaWiki\Extension\Notifications\Formatters\EchoMentionPresentationModel" not found in C:\xampp\htdocs\extensions\DiscussionTools\includes\Notifications\EnhancedEchoMentionPresentationModel.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\DiscussionTools\includes\Notifications\EnhancedEchoMentionPresentationModel.php on line 15