Fatal error: Uncaught Error: Class "yii\base\ModelEvent" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/content/events/ContentEvent.php:15 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/content/events/ContentEvent.php on line 15