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