Fatal error: Uncaught Error: Class "Symfony\Flex\Configurator\AbstractConfigurator" not found in /var/www/html/vendor/symfony/flex/src/Configurator/ContainerConfigurator.php:21 Stack trace: #0 {main} thrown in /var/www/html/vendor/symfony/flex/src/Configurator/ContainerConfigurator.php on line 21