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