Fatal error: Uncaught Error: Interface 'Symfony\Component\Config\Definition\ConfigurationInterface' not found in /home/lafaamicps/www/symfony/vendor/pixassociates/sortable-behavior-bundle/Pix/SortableBehaviorBundle/DependencyInjection/Configuration.php:21 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/pixassociates/sortable-behavior-bundle/Pix/SortableBehaviorBundle/DependencyInjection/Configuration.php on line 21