old/application/controllers/admin/Dashboard.php

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

class Dashboard extends MY_Controller {

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

	public function index()
    {
        $this->neededPermission('dashboard.view');

        $this->load->view('admin/sidebar', ['title' => 'Dashboard']);
        $this->load->view('admin/dashboard');
        $this->load->view('admin/footer');
    }
}