Fatal error: Uncaught Error: Class "Doctrine\Common\DataFixtures\Loader" not found in /var/www/html/API_Forum/vendor/doctrine/doctrine-fixtures-bundle/src/Loader/SymfonyFixturesLoader.php:20 Stack trace: #0 {main} thrown in /var/www/html/API_Forum/vendor/doctrine/doctrine-fixtures-bundle/src/Loader/SymfonyFixturesLoader.php on line 20