Fatal error: Uncaught Error: Class 'Sonata\CoreBundle\Exporter\Exporter' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Export/Exporter.php:19 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Export/Exporter.php on line 19