Fatal error: Uncaught Error: Interface "ILIAS\UI\Component\Layout\Page\Page" not found in /var/www/html/ilias/components/ILIAS/UI/src/Component/Layout/Page/Standard.php:37 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/UI/src/Component/Layout/Page/Standard.php on line 37