Fatal error: Uncaught Error: Interface "ILIAS\UI\Component\Input\Field\UploadHandler" not found in /var/www/html/ilias/components/ILIAS/LegalDocuments/classes/FileUpload/UploadHandler.php:31 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/LegalDocuments/classes/FileUpload/UploadHandler.php on line 31