Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Loader\Configurator\AbstractServiceConfigurator" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\dependency-injection\Loader\Configurator\ServiceConfigurator.php:21 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\dependency-injection\Loader\Configurator\ServiceConfigurator.php on line 21