Service 'config' was not found in the dependency injection container

This is my index.php

<?php

error_reporting(E_ALL);

try {

    /**
     * Read the configuration
     */
    $config = new Phalcon\Config\Adapter\Ini(__DIR__ . '/../app/config/config.ini');

    $loader = new \Phalcon\Loader();
    /**
     * We're a registering a set of directories taken from the configuration file
     */
    $loader->registerDirs(
        array(
            __DIR__ . $config->application->controllersDir,
            __DIR__ . $config->application->pluginsDir,
            __DIR__ . $config->application->libraryDir,
            __DIR__ . $config->application->modelsDir,
        )
    )->register();

    /**
     * The FactoryDefault Dependency Injector automatically register the right services providing a full stack framework
     */
    $di = new \Phalcon\DI\FactoryDefault();

    /**
     * We register the events manager
     */
    $di->set('dispatcher', function() use ($di) {

        $eventsManager = $di->getShared('eventsManager');

        $security = new Security($di);

        /**
         * We listen for events in the dispatcher using the Security plugin
         */
        $eventsManager->attach('dispatch', $security);

        $dispatcher = new Phalcon\Mvc\Dispatcher();
        $dispatcher->setEventsManager($eventsManager);

        return $dispatcher;
    });
    //echo $config->application->baseUri;
    /**
     * The URL component is used to generate all kind of urls in the application
     */
    $di->set('url', function() use ($config){
        $url = new \Phalcon\Mvc\Url();
        $url->setBaseUri($config->application->baseUri);
        return $url;
    });

    /**
     * Database connection is created based in the parameters defined in the configuration file
     */
    $di->set('db', function() use ($config) {
        return new \Phalcon\Db\Adapter\Pdo\Mysql(array(
            "host" => $config->database->host,
            "username" => $config->database->username,
            "password" => $config->database->password,
            "dbname" => $config->database->name
        ));
    });

    /**
     * If the configuration specify the use of metadata adapter use it or use memory otherwise
     */
    $di->set('modelsMetadata', function() use ($config) {
        if (isset($config->models->metadata)) {
            $metaDataConfig = $config->models->metadata;
            $metadataAdapter = 'Phalcon\Mvc\Model\Metadata\\'.$metaDataConfig->adapter;
            return new $metadataAdapter();
        }
        return new Phalcon\Mvc\Model\Metadata\Memory();
    });

    /**
     * Start the session the first time some component request the session service
     */
    $di->set('session', function(){
        $session = new Phalcon\Session\Adapter\Files();
        $session->start();
        return $session;
    });

    /**
     * Register the flash service with custom CSS classes
     */
    $di->set('flash', function(){
        return new Phalcon\Flash\Direct(array(
            'error' => 'alert alert-error',
            'success' => 'alert alert-success',
            'notice' => 'alert alert-info',
        ));
    });

    $di->set(
    'flashSession',
    function(){
    $flash = new \Phalcon\Flash\Session(
    array(
    'error' => 'alert alert-danger',
    'success' => 'alert alert-success',
    'notice' => 'alert alert-info',
    'warning' => 'alert alert-warning',
    )
    );
    return $flash;
    }
    );

    $di->set('view', function() use ($config) {

        $view = new \Phalcon\Mvc\View();

        $view->setViewsDir(__DIR__ . $config->application->viewsDir);

        $view->registerEngines(array(
            '.phtml' => 'Phalcon\Mvc\View\Engine\Php'
        ));

        return $view;
    });

    /**
     * Register a user component
     */
    $di->set('elements', function(){
        return new Elements();
    });

    $application = new \Phalcon\Mvc\Application();
    $application->setDI($di);
    echo $application->handle()->getContent();

} catch (Phalcon\Exception $e) {
    echo $e->getMessage();
} catch (PDOException $e){
    echo $e->getMessage();
}