Preventing DRY in OOP

[eluser]behnampmdg3[/eluser]
Didn't work; I get

Fatal error: Class 'My_Logged_Class' not found

Saved this as My_Logged_Class.php in application/core

Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class My_Logged_Class extends CI_Controller {


protected $logged;
protected $unread = 0;
protected $ad_without_photo_found = '';
protected $year = "";
public $email = "";
public function __construct()
{
  parent::__construct();
  if(isset($this->session->userdata['logged_data']['logged_in']))
  {
   if($this->session->userdata['logged_data']['logged_in']!=1 || !is_numeric($this->session->userdata['logged_data']['member_id']))
   {
    redirect(base_url('log_in'), 'refresh');
   }
    
   //Unread Messages
   $data['unread'] = $this->model_ads->unread_messages($this->session->userdata['logged_data']['member_id']);
   $this->unread = $data['unread'][0]->messages;
    
   //Check if Ad with no photo exists
   $data['have_no_photo'] = $this->model_ads->my_haves_no_photo($this->session->userdata['logged_data']['member_id']);
   $data['ad_without_photo_found'] = '';
   foreach($data['have_no_photo'] as $val => $row)
   {
    if($row->PID==0)
    {
     $this->ad_without_photo_found = '<li><a  href="'.base_url('account/index/2').'"><button type="button" class="btn btn-danger">Incomplete Ad found! Click here to resolve.</button></a></li>';
    }
   }
  }
  else
  {
   redirect(base_url('log_in'), 'refresh');
  }
  
}

public function index()
  {
  
  }

}

And this is my other class

Code:

class Member_details extends My_Logged_Class {

Um, not sure what to do.