Загрузка в шаблон MS WORD данных

private void ReplaceWordStub(string stubToReplace, string text, Word.Document wordDocument)
        {
            var range = wordDocument.Content;
            range.Find.ClearFormatting();
            range.Find.Execute(FindText: stubToReplace, ReplaceWith: text);
        }
 
 
        private void button2_Click(object sender, EventArgs e)
        {
            string pro_id_pledge = Global_class.pro_photo;
 
            var wordApp = new Word.Application();
            wordApp.Visible = false;
            string thisputh = Global_class.puth + @"\contrat_pledge.docx";
 
            var wordDocument = wordApp.Documents.Open(@thisputh);
            loadcompany();
            loadpledge(pro_id_pledge);
            loadclient(t_pledge_pro_id_client);
            loaddocument(t_client_pro_id_client);
            loadtarif(t_pledge_pro_id_rate);
            try
            {
                ReplaceWordStub("{t_company.name}", t_company_pro_name, wordDocument);
                ReplaceWordStub("{t_company.actual_adress}", t_company_pro_actual_adress, wordDocument);
                ReplaceWordStub("{t_company.inn}", t_company_pro_inn, wordDocument);
                ReplaceWordStub("{t_company.kpp}", t_company_pro_kpp, wordDocument);
                ReplaceWordStub("{t_company.okpo}", t_company_pro_okpo, wordDocument);
                ReplaceWordStub("{t_company.ogrn}", t_company_pro_ogrn, wordDocument);
                ReplaceWordStub("{t_pledge.sum_pledge}", t_pledge_pro_sum_pledge.ToString(), wordDocument);
                ReplaceWordStub("{t_pledge.time_pledge}", t_pledge_pro_time_pledge.ToString(), wordDocument);
                ReplaceWordStub("{t_pledge.return}", t_pledge_pro_data.AddDays(t_pledge_pro_time_pledge).ToString(), wordDocument);
                ReplaceWordStub("{t_client}", t_client_pro_surname + " " + t_client_pro_name + " " + t_client_pro_patronymic, wordDocument);
                ReplaceWordStub("{t_client.birth}", t_client_pro_date_birth.ToShortDateString().ToString(), wordDocument);
                ReplaceWordStub("{t_client.doc}", t_document_pro_tip_documenta, wordDocument);
                ReplaceWordStub("{t_client.doc.series}", t_document_pro_series, wordDocument);
                ReplaceWordStub("{t_client.doc.number}", t_document_pro_number, wordDocument);
                ReplaceWordStub("{t_client.doc.date_of}", t_document_pro_date_of.ToShortDateString().ToString(), wordDocument);
// ******************************************************
                ReplaceWordStub("{t_client.doc.issued}", t_document_pro_issued, wordDocument);// Ошибку выдает на эту строку
//**********************************************************
                ReplaceWordStub("{t_rate.time_delay}", t_rate_pro_time_delay.ToString(), wordDocument);
                ReplaceWordStub("{loan_return}", (t_pledge_pro_data.AddDays(t_pledge_pro_time_pledge + t_rate_pro_time_delay)).ToShortDateString().ToString(), wordDocument);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
 
            saveFileDialog1.Filter = "docx|*.docx";
            saveFileDialog1.FilterIndex = 1;
            saveFileDialog1.RestoreDirectory = true;
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                wordDocument.SaveAs2(@saveFileDialog1.FileName.ToString());
                wordApp.Visible = true;
            }
   
        }