Fatal error: Uncaught Error: Class "humhub\widgets\ModalButton" not found in /users/quirl/www/filemanager/spark/protected/humhub/modules/space/widgets/views/inviteButton.php:7 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/humhub/modules/space/widgets/views/inviteButton.php on line 7