php - MPDF Fatal error: Call to a member function WriteHTML() on null -


i want export data pdf file try use mpdf. following step step of tutorial, getting error

fatal error: call member function writehtml() on null in c:\xampp\htdocs\laboratorium\application\controllers\beranda.php on line 506

in controller 

$this->load->library('m_pdf');     $this->load->model('mod');     $data['result'] = $this->mod->getreport();      $html = $this->load->view('report', $data);     $this->m_pdf->pdf->writehtml($html);      //download it.     $this->m_pdf->pdf->output($pdffilepath, "d");

and sure $html not null. try load , working. why happen?

try 

   $this->load->library('m_pdf');     $this->load->model('mod');     $data['result'] = $this->mod->getreport();      $html = $this->load->view('report', $data,true);     $this->m_pdf->pdf->writehtml($html);      //download it.     $this->m_pdf->pdf->output($pdffilepath, "d");

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