Fatal error: Uncaught Error: Using $this when not in object context in /users/quirl/www/filemanager/spark/protected/humhub/modules/file/widgets/views/fileUploadButton.php:6 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/file/widgets/views/fileUploadButton.php on line 6