Fatal error: Uncaught Error: Class "Symfony\Flex\Configurator\AbstractConfigurator" not found in /var/www/html/API_Forum/vendor/symfony/flex/src/Configurator/AddLinesConfigurator.php:14 Stack trace: #0 {main} thrown in /var/www/html/API_Forum/vendor/symfony/flex/src/Configurator/AddLinesConfigurator.php on line 14