slight problem with multiple file upload

Code:
function do_upload()

    {

        

        $this->folder = './uploads/';

        $this->dynamicFolder = get_realpath(APPPATH.$this->folder);

        

        $config['upload_path'] = $this->dynamicFolder;

        $config['allowed_types'] = 'gif|jpg|jpeg|png';

        $config['max_size'] = '1000';

        $config['max_width'] = '1920';

        $config['max_height'] = '1280';                        

        

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

        $this->upload->initialize($config);

        $field = 'userfile';

        

        if(isset ($_FILES[$field]) and is_array($_FILES[$field]['error']) )

        {

            $count = count($_FILES[$field]['error']);

            for ($i = 0; $i < $count; $i++)

            {

                $data = null;

                

                $pseudo_field_name = '_psuedo_'. $field .'_'. $i;

                

                $_FILES[$pseudo_field_name] = array(

               'name' => $_FILES[$field]['name'][$i],

               'size' => $_FILES[$field]['size'][$i],

               'type' => $_FILES[$field]['type'][$i],

               'tmp_name' => $_FILES[$field]['tmp_name'][$i],

               'error' => $_FILES[$field]['error'][$i]

                );

                

                $this->upload->do_upload($pseudo_field_name);

                $data = $this->upload->data();



                $success[$i] = $data['file_name'];

                

                $this->_createThumbnail_small($data['file_name']);

                

                $data['uploadInfo'] = $data;

                $data['thumbnail_small'] = $data['raw_name'] . '_small' . $data['file_ext'];

                

                $this->session->set_flashdata('notice',$success[$i]);

                $this->load->view('my_upload_success',$data);



            }

        }else{

            

            if(!$this->upload->do_upload($field))

            {

                //$success = array('error' => $this->upload->display_errors());

                //$this->session->set_flashdata('notice',$success);

                // $this->load->view('my_upload');

                //redirect(base_url().'my_upload','location');

                echo $this->upload->display_errors();

            }

            else {

                $data = $this->upload->data();

                $success = $data['file_name'];

                //$this->session->set_flashdata('notice',$success);

                //redirect(base_url().'my_upload_success','location');

            }

        }

    }