Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\ContainerBuilder' not found in /home/eberhardschwarze/public_html/vendor/contao/manager-plugin/src/Config/ContainerBuilder.php:17 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao/manager-plugin/src/Config/ContainerBuilder.php on line 17