Can't load pdf with using Mpdf in Codeigniter 4

Excuse me , i need help .. why my code can't load pdf .? I'm using Mpdf .. how to load view if view made variable ??
this is my code

//CONTROLLER (app/controller)
<?php namespace App\Controllers;
use App\Models\PesertaModel;
use App\Models\KondisiModel;
use App\Models\UserModel;
use App\Models\GejalaModel;
use MPDF;
class Reporting extends BaseController
{
    public function cetakpdf()
    {
        $data['datapeserta'] = $this->pesertaModel->getpeserta()->getResult();

        $sumber = view('test',$data);

        $mpdf = new \Mpdf\Mpdf(['mode' => 'utf-8', 'format' => 'A4', 'margin_left' => 10, 'margin_top' => 10, 'margin_right' => 10, 'margin_bottom' => 1, 'orientation' => 'P' ]);

        $mpdf->WriteHTML($sumber);

        $this->response->setHeader('Content-Type', 'application/pdf');
        return redirect()->to($mpdf->Output('Cetak Peserta.pdf', 'I'));
    }
}



//AUTOLOAD (app/config/autoload.php)
$classmap = [
            'MPDF' => APPPATH .'Libraries/mpdf.php'
];


//LIBRARIES (app/libraries/mpdf.php)

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class mpdf {
    
    function m_pdf()
    {
        $CI = & get_instance();
        log_message('Debug', 'mPDF class is loaded.');
    }
 
    function load($param=NULL)
    {
        include_once APPPATH.'/third_party/mpdf60/mpdf.php';
         
        if ($params == NULL)
        {
            $param = '"en-GB-x","A4","","",10,10,10,10,6,3';          
        }
         
        return new mPDF($param);
    }
}