Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Loader\LoaderResolverInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\config\Loader\LoaderResolver.php:22 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\config\Loader\LoaderResolver.php on line 22