Fatal error: Uncaught Error: Using $this when not in object context in /users/quirl/www/filemanager/spark/protected/humhub/modules/user/notifications/views/mails/mentionedComment.php:12 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/user/notifications/views/mails/mentionedComment.php on line 12