Eror ketika web di hosting, dompdf gagal dimuat

hai para suhu ijin bertanya , saya mendapatkan masalah ketika web saya di hosting dompdf gagal dimuat, tetapi ketika menggunakan local server web berfungsi dengan baik .. Minta tolong Pencerahannya Para Suhu..

//controllers

$this->load->library('dompdf_gen');
            $this->load->view('pasien/cetakbuktipendaftaran', $data);

            $paper_size = 'A4';
            $orientation = 'landscape';
            $html = $this->output->get_output();
            $this->dompdf->set_paper($paper_size, $orientation);

            $this->dompdf->load_html($html);
            $this->dompdf->render();
            $this->dompdf->stream("Bukti Pendaftaran pasien.pdf", array('Attachment' => 1));

//libraries

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

/**
 * Name:  DOMPDF
 *
 * Author: Jd Fiscus
 * 	 	  jdfiscus@gmail.com
 *         @iamfiscus
 *
 *
 * Origin API Class: http://code.google.com/p/dompdf/
 *
 * Location: http://github.com/iamfiscus/Codeigniter-DOMPDF/
 *
 * Created:  06.22.2010
 *
 * Description:  This is a Codeigniter library which allows you to convert HTML to PDF with the DOMPDF library
 *
 */

class Dompdf_gen
{

	public function __construct()
	{

		require_once APPPATH . 'third_party/dompdf/dompdf_config.inc.php';

		$pdf = new DOMPDF();

		$CI = &get_instance();
		$CI->dompdf = $pdf;
	}
}