Fatal error: Uncaught Error: Class "Doctrine\Common\DataFixtures\Loader" not found in /var/www/html/vendor/doctrine/doctrine-fixtures-bundle/src/Loader/SymfonyBridgeLoader.php:19 Stack trace: #0 {main} thrown in /var/www/html/vendor/doctrine/doctrine-fixtures-bundle/src/Loader/SymfonyBridgeLoader.php on line 19