Fatal error: Uncaught Error: Interface "ILIAS\FileUpload\Collection\ImmutableStringMap" not found in /var/www/html/ilias/components/ILIAS/FileUpload/src/Collection/StringMap.php:30 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/FileUpload/src/Collection/StringMap.php on line 30