Fatal error: Uncaught Error: Class "Doctrine\ORM\Query\ResultSetMapping" not found in /var/www/crm_killing_ninja/vendor/doctrine/orm/src/Query/ResultSetMappingBuilder.php:27 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/vendor/doctrine/orm/src/Query/ResultSetMappingBuilder.php on line 27