Fatal error: Uncaught Error: Class "ILIAS\UI\Implementation\Render\AbstractComponentRenderer" not found in /var/www/html/ilias/components/ILIAS/UI/src/Implementation/Component/Dropdown/Renderer.php:30 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/UI/src/Implementation/Component/Dropdown/Renderer.php on line 30