Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Builder\ConfigBuilderGeneratorInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Builder/ConfigBuilderGenerator.php:32 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Builder/ConfigBuilderGenerator.php on line 32