集成文件管理器[Codeigniter]

I am using code codeigniter 3x. I am trying to integrate a file manager - Responsive FileManager 9.11.3 .

I tried many time to integrate but everytime getting error.

Controller file .

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

    class Filemanager extends CI_Controller {

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


        public function index() {
             $this->load->helper('path');
             $this->load->library('filemanagerx');
             $this->filemanagerx->fmanager();
         }

    }

library file .

if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 
   class Filemanagerx {
        public function fmanager() {
           include_once 'filemanager/dialog.php';
    }
}