I'm trying to add the following:
require_once __DIR__.'/vendor/autoload.php';
require_once __DIR__.'/settings.php';
require_once __DIR__.'/resources.php';
require_once __DIR__.'/utils.php';
use Spire\Settings;
use Spire\Resources;
use Spire\Utils;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Silex\Application;
But the server returns me error where there is the use of the backslash ("\"). What is the configuration required for the server to recognize it correctly?