Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\SerializerInterface" not found in /home/tubu/public_html/Opigno_D9_kedecs/opigno-composer/vendor/symfony/serializer/Serializer.php:47 Stack trace: #0 {main} thrown in /home/tubu/public_html/Opigno_D9_kedecs/opigno-composer/vendor/symfony/serializer/Serializer.php on line 47