Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Mapping\ElementMetadata" not found in C:\AppServ\www\greenhess-storage\vendor\symfony\validator\Mapping\MemberMetadata.php:30 Stack trace: #0 {main} thrown in C:\AppServ\www\greenhess-storage\vendor\symfony\validator\Mapping\MemberMetadata.php on line 30