Fatal error: Uncaught Error: Class "Symfony\Component\Console\Descriptor\Descriptor" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\console\Descriptor\JsonDescriptor.php:27 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\console\Descriptor\JsonDescriptor.php on line 27