Fatal error: Uncaught Error: Interface 'Exporter\Writer\WriterInterface' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/exporter/lib/Exporter/Writer/GsaFeedWriter.php:19 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/exporter/lib/Exporter/Writer/GsaFeedWriter.php on line 19