Fatal error: Uncaught Error: Class 'Sonata\CoreBundle\Model\BaseEntityManager' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/classification-bundle/Entity/TagManager.php:20 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/classification-bundle/Entity/TagManager.php on line 20