Fatal error: Uncaught Error: Class 'Twig_Extension' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/core-bundle/Twig/Extension/FlashMessageExtension.php:23 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/core-bundle/Twig/Extension/FlashMessageExtension.php on line 23