Fatal error: Uncaught Error: Interface "Symfony\Component\Security\Core\User\UserCheckerInterface" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\security-core\User\InMemoryUserChecker.php:24 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\security-core\User\InMemoryUserChecker.php on line 24