Fatal error: Uncaught Error: Interface "Symfony\Component\Security\Core\User\UserCheckerInterface" not found in /home/creantis/840suite.creantis.dev/840suite01/core/backend/Security/UserChecker.php:36 Stack trace: #0 {main} thrown in /home/creantis/840suite.creantis.dev/840suite01/core/backend/Security/UserChecker.php on line 36