Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Mapping\ClassDiscriminatorResolverInterface" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\serializer\Mapping\ClassDiscriminatorFromClassMetadata.php:19 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\serializer\Mapping\ClassDiscriminatorFromClassMetadata.php on line 19