Fatal error: Uncaught Error: Class 'Symfony\Component\Form\AbstractType' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/block-bundle/Form/Type/ContainerTemplateType.php:27 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/block-bundle/Form/Type/ContainerTemplateType.php on line 27