Validation problem - Config | Callback | Controller

[eluser]Multisnet[/eluser]
Yes I changed the prefix. I extended many other classes without any problem, I'm using MO_Controller perfectly.

Code:

class MO_Controller extends Controller {
  function MO_Controller()
  {
        parent::Controller();
}
}

I realize now that the functions from form_validation don't work correctly (e.g. set_select() prints selected in every option).

I can't understand the problem.