Displaying QR Code in PDF file, in Laravel

I'm facing a problem with displaying a QR code in a PDF file. When I try to display the QR code without PDF it works. The QR code is generated by https://github.com/SimpleSoftwareIO/simple-qrcode on to a pdf file generated by https://github.com/barryvdh/laravel-dompdf/tree/0.8.5

StudentController.php:

public function view_downlads($id){
    $pdf = PDF::loadView('Student.markscardpdf');
    return $pdf->stream();
}

Student/markscardpdf.blade.php:

via Chebli Mohamed