[v2] - getting Undefined property with model

I have the following code which giving me Undefined property: Uploader::$mod_Photoalbums_model

PHP Code:

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

class Uploader extends MY_Controller {
    public function __construct() {
        parent::__construct();
        
        $this->load->library('image_lib');
        $this->load->library('qquploadedfilexhr');
        $this->load->model('Uploader_model');
        $this->load->model('Portfolio_model'); 
        $this->load->model('mod_Photoalbums_model');
        }

        public function insertIntoDatabase($id, $module, $filename, $thumbnail, $folder) {
        $result = false;

        switch ($module) {            
            case 'portfolio_images':
                //PORTFOLIO - IMAGES
                

                $result = $this->Portfolio_model->add_image($id, $module, $filename, $thumbnail, $folder);
                
                break;                
            case 'photoalbums_images':
                //PHOTOALBUM - IMAGES
                
                $result = $this->mod_Photoalbums_model->add_image($id, $module, $filename, $thumbnail, $folder);
                
                break;
            case 'pages':
                //PAGES > CONNECTIONS (tab3) > UPLOADS
                
                $result = $this->page_model->addUploadToDatabase($id, $module, $filename, null, $folder, $this->upload_title, $this->upload_desc);
                
                break;
        }
        
        return $result;
    }

} 


Photoalbum Model > On filesystem the name is lowercase

PHP Code:

class mod_Photoalbums_model extends MY_Model {
    public function __construct() {
        parent::__construct();
    }

//ETC ETC
} 


Code:

Severity: Notice
Message:  Undefined property: Uploader::$mod_Photoalbums_model
Filename: controllers/uploader.php
Line Number: 188

Anyone ?