Fatal error: Uncaught Error: Class "MediaWiki\Notification\Notification" not found in /usr/www/otte/public/sphunt1/extensions/Echo/includes/Notifications/UserRightsNotification.php:15 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/Echo/includes/Notifications/UserRightsNotification.php on line 15