Fatal error: Uncaught Error: Class 'Symfony\Flex\Configurator\AbstractConfigurator' not found in /var/www/api_backup/vendor/symfony/flex/src/Configurator/ComposerScriptsConfigurator.php:23 Stack trace: #0 {main} thrown in /var/www/api_backup/vendor/symfony/flex/src/Configurator/ComposerScriptsConfigurator.php on line 23