Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Builder\ConfigBuilderInterface" not found in D:\xampp\htdocs\pimcore\my-project\var\installer\build\Symfony\Config\FrameworkConfig.php:48 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\var\installer\build\Symfony\Config\FrameworkConfig.php on line 48