Codeigniter HMVC Modular Error - codeigniter

Question

I'm new to CI + MX and I tried the Modules::run(); style but I can't seem to let it work.
Here's my directory structure:
/application
-/modules
--/main
---/controllers
----main.php
---/models
---/views
--/connections
---/controllers
----connections.php
---/models
----/group_model.php
---/views
----connection_view.php
main.php controller:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Main extends MX_Controller {
function __construct(){
parent::__construct();
$this->load->helper('url');
}
function index(){
echo modules::run('connections/load_connections');
}
}
?>
connections.php controller:
<?php
class Connections extends CI_Controller{
function __construct(){
parent::__construct();
$this->load->helper('url');
$this->load->model('connections/group_model');
}
function load_connections(){
$user_id = 2;
$data['tabs'] = $this->group_model->get_groups($user_id);
$this->load->view('connection_view', $data);
}
}
?>
group_model.php model:
class Group_model extends CI_Model{
function __construct(){
parent::__construct();
}
/**
* Get all groups in db
**/
function get_groups($user_id){
$this->db->select('g.group_name');
$this->db->from('groups AS g');
$this->db->join('members AS m', 'g.group_id = m.group_id');
$this->db->where('m.user_id', $user_id);
return $this->db->get()->result_array();
}
}
My connection_view.php view contains a div and some php codes to display the $data['tabs'] passed as array in load_connections function.
The problem is, I'm getting an error that says:
A PHP Error was encountered
Severity: Notice
Message: Undefined property: Connections::$group_model
Filename: controllers/connections.php
Line Number: 14
and
Fatal error: Call to a member function get_groups() on a non-object in C:\xampp\htdocs\hmvc\application\modules\connections\controllers\connections.php on line 14
I have clearly followed all the instructions provided on MX wiki at https://bitbucket.org/wiredesignz/codeigniter-modular-extensions-hmvc/wiki/Home
and set up everything as needed.
My database.php under /application/config is already configured.
routes.php is also configured pointing the default controller to main.php
I wonder what I have missed or have done wrong that I can't get it to work.
Codeigniter version: 2.1.3
MX version: 5.4

Answer 1

almost missed it, extend connections with MX_Controller since you are calling modules::run(). Whenever you want a controller to be called with modules::run(), you extend it with MX_Controller instead of CI_Controller
Your second error is caused because of your first error.
Your first error is most likely caused because it cant open the group_model.
try this
$this->load->model('group_model');