Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\SerializerInterface' not found in /var/www/legtux.org/users/weboconsulting/www/vendor/symfony/serializer/Serializer.php:49 Stack trace: #0 {main} thrown in /var/www/legtux.org/users/weboconsulting/www/vendor/symfony/serializer/Serializer.php on line 49