Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Mapping\GenericMetadata" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\validator\Mapping\ClassMetadata.php:29 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\validator\Mapping\ClassMetadata.php on line 29