Fatal error: Uncaught Error: Interface 'FOS\UserBundle\Model\GroupManagerInterface' not found in /home/itscm/dev.its.cm/webserivesits/vendor/friendsofsymfony/user-bundle/Model/GroupManager.php:20 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/webserivesits/vendor/friendsofsymfony/user-bundle/Model/GroupManager.php on line 20