Fatal error: Uncaught Error: Interface 'Symfony\Component\Config\Definition\ConfigurationInterface' not found in /home/eberhardschwarze/public_html/vendor/contao/core-bundle/src/DependencyInjection/Configuration.php:23 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao/core-bundle/src/DependencyInjection/Configuration.php on line 23