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 // require pdf libraries
        $core_path = substr(COREPATH, 0, -12);
        require_once $core_path . '/application/libraries/phpdocx-premium-14-ns/Classes/Phpdocx/Create/CreateDocx.php';
        require_once $core_path . '/application/libraries/phpdocx-premium-14-ns/Classes/Phpdocx/Libs/TCPDF_lib.php';

        // create the signed pdf
        $signed_pdf  = new Phpdocx\Libs\TCPDI();
        $page_count  = $signed_pdf->setSourceFile($pdf_to_sign);
        for ($page_no = 1; $page_no <= $page_count; $page_no++) {
            $signed_pdf->AddPage();
            $signed_pdf->SetAutoPageBreak(false);
            $template_id = $signed_pdf->importPage($page_no);
            $signed_pdf->useTemplate($template_id);
            $objects = array('signature' => $params['signature_picture'], 'stamp' => $params['stamp_picture'], 'name' => $params['user_full_name'], 'designation' => $params['designation'], 'date' => $params['sign_date']);
            foreach ($objects as $object => $object_value) {
                foreach ($params['user_signature_info']->$object->pages as $page_details) {
                    if ($page_no == $page_details->number) {
                        $template_size = $signed_pdf->getTemplateSize($template_id);
                        if(in_array($object, array('signature', 'stamp'))){
                            $signed_pdf->Image(file : $object_value, x : $page_details->coordinates->x, y : $page_details->coordinates->y, w : 60, h : $object == 'signature' ? 30 : 0);
                        }
                        else{
                            if(preg_match('/\p{Arabic}/u', $object_value)){
                                $signed_pdf->SetFont('aealarabiya', '', 14);
                            }
                            $signed_pdf->Text(x : $page_details->coordinates->x, y : $page_details->coordinates->y, txt : $object_value);
                        }
                    }      
                }
            }
        }

When changed to phpdocx 14, when signing the document, the pdf I'm getting is 1 blank page. Why?