Fatal error: Uncaught Error: Class 'FOS\UserBundle\Document\GroupManager' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Document/GroupManager.php:24 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/user-bundle/Document/GroupManager.php on line 24