Fatal error: Uncaught Error: Interface 'Psr\Container\ContainerInterface' not found in /home/devmecseminars/public_html/mec/vendor/symfony/service-contracts/ServiceProviderInterface.php:22 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/service-contracts/ServiceProviderInterface.php on line 22