Fatal error: Uncaught Error: Class 'FOS\UserBundle\Entity\GroupManager' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Entity/GroupManager.php:27 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Entity/GroupManager.php on line 27