Fatal error: Uncaught Error: Class "Symfony\Component\Console\Command\Command" not found in D:\Webserver\Apache24\htdocs\testephp\signxml\vendor\symfony\serializer\Command\DebugCommand.php:31 Stack trace: #0 {main} thrown in D:\Webserver\Apache24\htdocs\testephp\signxml\vendor\symfony\serializer\Command\DebugCommand.php on line 31