Fatal error: Uncaught Error: Class "Metadata\ClassMetadata" not found in C:\xampp\htdocs\electronica\vendor\jms\di-extra-bundle\JMS\DiExtraBundle\Metadata\ClassMetadata.php:23 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\jms\di-extra-bundle\JMS\DiExtraBundle\Metadata\ClassMetadata.php on line 23