Fatal error: Uncaught Error: Interface 'JMS\Serializer\SerializerInterface' not found in /home/ffl2020/public_html/vendor/jms/serializer/src/Serializer.php:26 Stack trace: #0 {main} thrown in /home/ffl2020/public_html/vendor/jms/serializer/src/Serializer.php on line 26