Fatal error: Uncaught Error: Interface 'Symfony\Component\DependencyInjection\Argument\ArgumentInterface' not found in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/Argument/ServiceClosureArgument.php:22 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/Argument/ServiceClosureArgument.php on line 22