Fatal error: Uncaught Error: Interface "Symfony\Component\Security\Core\User\UserCheckerInterface" not found in /var/www/apache/dev/cal/web/vendor/symfony/security/Core/User/UserChecker.php:24 Stack trace: #0 {main} thrown in /var/www/apache/dev/cal/web/vendor/symfony/security/Core/User/UserChecker.php on line 24