Fatal error: Uncaught Error: Interface "FOS\UserBundle\Model\GroupManagerInterface" not found in /home/steevedfem/ekolaweb/vendor/friendsofsymfony/user-bundle/Model/GroupManager.php:20 Stack trace: #0 {main} thrown in /home/steevedfem/ekolaweb/vendor/friendsofsymfony/user-bundle/Model/GroupManager.php on line 20