Extending CI_Controller

[eluser]boytun[/eluser]
Hello
In my application I use HMVC structure, so i try ti extand the MX_Controller with CI_Controller, so that I can load my modules in the mvc views.
I try this:
In the core folder

Code:

class MX_Controller extends MY_Controller {

public function index()
{
  
}

}

Code:

class MY_Controller extends CI_Controller {

public function __construct()
{
  parent::__construct();
}

public function index()
{
  
}

}

In the librairies folder

Code:

class Frontend_Controller extends MY_Controller {

public function __construct()
{

}

}

In the controllers folder

Code:

class Article extends Frontend_Controller {

public function __construct()
{
  parent::__construct();
}

public function index()
{
$this->load->view('myview');
}

}

In the view folder (myview.php')

Code:

<?php echo Modules::run('tasks') ; ?>

the tasks module is juste contains a echout sentence in the HMVC view

But I get this error
Fatal error: Cannot redeclare class CI in C:\xampp\htdocs\application\third_party\MX\Base.php on line 57

Please I need your Help
Thanks in advance