error 500 by postman when connecting phalcon with mongodb

I am trying to connect the phalcon framework with the non-relational database mongo DB, by making the configurations shown on the phalcon page and some forums, I still can not make the connection and every time I want to make a query or any interaction with the database I get an error 500 in postman. (I followed the steps of this post right away from the phalcon documentation link ) Thank you in advance for the help.

Config.php

return new \Phalcon\Config([
'database' => [
    'adapter'     => 'Mongodb',
    'host'        => 'localhost',
    'username'    => 'root',
    'password'    => '',
    'dbname'      => 'trackdb',
    'charset'     => 'utf8',
],
'application' => [
    'appDir'         => APP_PATH . '/',
    'controllersDir' => APP_PATH . '/controllers/',
    'modelsDir'      => APP_PATH . '/models/',
    'migrationsDir'  => APP_PATH . '/migrations/',
    'viewsDir'       => APP_PATH . '/views/',
    'pluginsDir'     => APP_PATH . '/plugins/',
    'libraryDir'     => APP_PATH . '/library/',
    'cacheDir'       => BASE_PATH . '/cache/',

    // This allows the baseUri to be understand project paths that are not in the root directory
    // of the webpspace.  This will break if the public/index.php entry point is moved or
    // possibly if the web server rewrite rules are changed. This can also be set to a static path.
    'baseUri'        => preg_replace('/public([\/\\])index.php$/', '', $_SERVER["PHP_SELF"]),
]
]);

Loader.php

// Define some absolute path constants to aid in locating resources
define('BASE_PATH', dirname(__DIR__));
define('APP_PATH', BASE_PATH . '/app');
// ...

$loader = new Loader();

$loader->registerDirs(
[
    APP_PATH . '/controllers/',
    APP_PATH . '/models/',
]
);

$loader->register();

services.php

use Phalcon\Mvc\Collection\Manager;
use Phalcon\Db\Adapter\MongoDB\Client;
// Initialise the mongo DB connection.
$di->setShared('mongo', function () {
    /** @var \Phalcon\DiInterface $this */
    $config = $this->getShared('config');

    if (!$config->database->mongo->username || !$config->database->mongo->password) {
        $dsn = 'mongodb://' . $config->database->mongo->host;
    } else {
        $dsn = sprintf(
            'mongodb://%s:%s@%s',
            $config->database->mongo->username,
            $config->database->mongo->password,
            $config->database->mongo->host
        );
    }

    $mongo = new Client($dsn);

    return $mongo->selectDatabase($config->database->mongo->dbname);
});

// Collection Manager is required for MongoDB
$di->setShared('collectionManager', function () {
    return new Manager();
});

my model

use Phalcon\Mvc\Collection;

class Mtracks extends Collection
{
  public function initialize()
  {
      $this->setSource('recorrido');
  }
}

my driver

class PointController extends \Phalcon\Mvc\Controller
{

    public function indexAction()
    {

    }

    public function TrackAction()
    {
        $data = json_decode(file_get_contents("php://input"));

        print_r($data);

        try {
          $robots = Mtracks::find();
        } catch (\Exception $e) {
        print_r($e);
    }


    //    print_r($robots);
}