Fatal error: Uncaught Error: Class 'Twig\Extension\AbstractExtension' not found in /home/ffl2020/public_html/vendor/jms/serializer/src/Twig/SerializerBaseExtension.php:9 Stack trace: #0 {main} thrown in /home/ffl2020/public_html/vendor/jms/serializer/src/Twig/SerializerBaseExtension.php on line 9