Fatal error: Uncaught Error: Interface 'Symfony\Component\Config\Definition\ConfigurationInterface' not found in /home/eberhardschwarze/public_html/vendor/nelmio/security-bundle/DependencyInjection/Configuration.php:19 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/nelmio/security-bundle/DependencyInjection/Configuration.php on line 19