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