message file upload with flashdata

//controlell
$config['upload_path']          = base_url('/gambar');
        $config['allowed_types']        = 'gif|jpg|png';
        $config['max_size']             = 10;
        $config['max_width']            = 1024;
        $config['max_height']           = 768;

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

if(! $this->upload->do_upload('foto',FALSE)){
            $error = array('error_foto' => $this->upload->display_errors());
            $this->session->set_flashdata($error);
            $this->create_mhs();
        }

//view
echo $this->session->flashdata('error_foto');