Fatal error: Uncaught Error: Class "Doctrine\ORM\Query\ResultSetMapping" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\doctrine\orm\lib\Doctrine\ORM\Query\ResultSetMappingBuilder.php:27 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\doctrine\orm\lib\Doctrine\ORM\Query\ResultSetMappingBuilder.php on line 27