Fatal error: Uncaught Error: Interface "ILIAS\UI\Component\Symbol\Symbol" not found in /var/www/html/ilias/components/ILIAS/UI/src/Component/Symbol/Icon/Icon.php:28 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/UI/src/Component/Symbol/Icon/Icon.php on line 28