Fatal error: Uncaught Error: Interface 'Sonata\ClassificationBundle\Model\CollectionInterface' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/classification-bundle/Model/Collection.php:17 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/classification-bundle/Model/Collection.php on line 17