Fatal error: Uncaught Error: Interface "ILIAS\UI\Component\MainControls\Slate\Slate" not found in /var/www/html/ilias/components/ILIAS/UI/src/Component/MainControls/Slate/Legacy.php:26 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/UI/src/Component/MainControls/Slate/Legacy.php on line 26