Fatal error: Uncaught Error: Class 'FOS\UserBundle\Doctrine\GroupManager' not found in /home/lafaamicps/www/symfony/vendor/friendsofsymfony/user-bundle/FOS/UserBundle/Entity/GroupManager.php:21 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/friendsofsymfony/user-bundle/FOS/UserBundle/Entity/GroupManager.php on line 21