Slim Application Error

<?php

require_once '../vendor/autoload.php';

$container = new \Slim\Container;

$container['config'] = function ($c) {
    return new \Noodlehaus\Config('../config/app.php');
};

$container['view'] = function ($c) {
    $view = new \Slim\Views\Twig('../resources/views');

    $view->addExtension(new \Slim\Views\TwigExtension(
        $c['router'],
        $c['config']->get('url')
    ));

    return $view;
};

$container['db'] = function($c) {
    return new PDO('mysql:host=127.0.0.1;dbname=destructy', 'root', '');
};

$container['mail'] = function ($c) {
    return new \Mailgun\Mailgun($c['config']->get('services.mailgun.secret'));
};

$app = new \Slim\App($container);

require_once 'routes.php';