Fatal error: Uncaught Error: Class "Symfony\Component\Security\Core\User\UserChecker" not found in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Security\UserChecker.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Security\UserChecker.php on line 26