Fatal error: Uncaught Error: Interface 'Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface' not found in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/ParameterBag/ParameterBag.php:23 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/ParameterBag/ParameterBag.php on line 23