Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Mapping\ClassMetadataInterface" not found in D:\Webserver\Apache24\htdocs\testephp\signxml\vendor\symfony\serializer\Mapping\ClassMetadata.php:19 Stack trace: #0 {main} thrown in D:\Webserver\Apache24\htdocs\testephp\signxml\vendor\symfony\serializer\Mapping\ClassMetadata.php on line 19