Fatal error: Uncaught Error: Class 'Symfony\Flex\Configurator\AbstractConfigurator' not found in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\flex\src\Configurator\ContainerConfigurator.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\flex\src\Configurator\ContainerConfigurator.php on line 20