Clarification about MY_Controller and relative inheritances

@Dave friend, have you tried to var_dump in Backend_Controller's constructor? I'm afraid its not loaded. or try to instantiate it in your class Dashboard which is basically loaded by magic router.

PHP Code:

class Dashboard extends MY_Controller
{
    public function index()
    {
        // If this returns an error then your Backend_Controller is not loaded
        $oBackend = new Backend_Controller();
    }
} 


You extend My_Controller to CI_Controller while Backend_Controller extends MY_Controller. I think you missed it my friend. No one extends or instantiate Backend_Controller so no chance to access it's instance, your Dashboard also extends to MY_Controller. In your structure MY_Controller stands as your base class neither Backend_Controller nor Frontend_Controller. That's why.

God Bless CI Contributors