Fatal error: Uncaught Error: Using $this when not in object context in /users/quirl/www/filemanager/spark/protected/humhub/modules/comment/notifications/views/mails/newComment.php:21 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/comment/notifications/views/mails/newComment.php on line 21