Fatal error: Uncaught Error: Interface 'FOS\UserBundle\Model\GroupManagerInterface' not found in /home/almasai/www/people/_old_site/vendor/bundles/FOS/UserBundle/Model/GroupManager.php:20 Stack trace: #0 {main} thrown in /home/almasai/www/people/_old_site/vendor/bundles/FOS/UserBundle/Model/GroupManager.php on line 20