Class $this->load->initialize('upload', $config) problem with giving model

[eluser]Unknown[/eluser]
It was coding and realized that when I used $this->load->initializate('upload', $config); in a role he callback__do_upload instantiated model I carried the autoload.

My autoload config:

Code:

$autoload['model'] = array('m_galerias', 'm_parceiros');

My controller code:

Code:

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

class GD_Categorias extends CI_Controller {

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

    public function imgs($act = NULL, $cid = NULL, $img_id = NULL)
    {
        $data['act'] = $act ? $act : NULL;
        $data['cid'] = $cid ? $cid : NULL;
        $data['img_id'] = $img_id ? $img_id : NULL;

        if ( ! $cid)
        {
            redirect(site_url('admin/gd_categorias'), 'location');
        }

        foreach($this->m_galerias->pega_dados_categoria(urlsafe_b64decode($cid)) as $linha)
        {
            $data['categoria'] = $linha->categoria;
        }

        if ($act == 'add')
        {
            $this->load->helper('form');
         $this->load->library(array('form_validation', 'upload'));
            $this->form_validation->set_error_delimiters('<div class="error"><span>', '</span></div>');

            $this->form_validation->set_rules('userfile', '<strong>Imagem</strong>', 'callback__do_upload');

      if ($this->form_validation->run() === FALSE)
      {
                $output['content'] = $this->load->view('admin/gd_imagens_form', $data, TRUE);
            }
            else
            {
                $upd_data = $this->upload->data();

                $bd['gc_id'] = urlsafe_b64decode($cid);
                $bd['imagem'] = $upd_data['file_name'];
                $bd['data'] = date('Y-m-d H:i:s');

                $this->m_galerias->add_img($bd);

                redirect('admin/gd_categorias/imgs/view/'.$cid, 'location');
            }

            $this->load->view('layouts/admin', $output);
        }
    }

    public function _do_upload()
    {
        $config['upload_path'] = 'imgs/galerias/';
     $config['allowed_types'] = 'gif|jpg|jpeg|png';
     $config['max_size'] = '1024';
     $config['max_width']  = '1300';
     $config['max_height']  = '1000';
        $config['encrypt_name'] = TRUE;

     $this->load->initialize('upload', $config);

        if ( ! $this->upload->do_upload())
        {
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }

}

When I press the button to send the following error:

The model name you are loading is the name of a resource that is already being used: m_galerias

In the other files there is no loading model with this name!

It is an issue in ci or mine?
Sorry for the English is that I am Brazilian and thank you.