Fatal error: Uncaught Error: Class "FOS\UserBundle\Model\GroupManager" not found in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Doctrine\GroupManager.php:24 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Doctrine\GroupManager.php on line 24