Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\ParameterBag\ParameterBag' not found in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/ParameterBag/EnvPlaceholderParameterBag.php:20 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/dependency-injection/ParameterBag/EnvPlaceholderParameterBag.php on line 20