Fatal error: Uncaught Error: Class "Doctrine\Persistence\Mapping\Driver\MappingDriverChain" not found in /var/www/crm_killing_ninja/vendor/doctrine/orm/src/Mapping/Driver/DriverChain.php:14 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/vendor/doctrine/orm/src/Mapping/Driver/DriverChain.php on line 14