H5+微信支付报-1问题

 WxPayData jsApiParam = new WxPayData();
                jsApiParam.SetValue("appid", WxPayConfig.APPID);
                jsApiParam.SetValue("partnerid", WxPayConfig.MCHID);
                jsApiParam.SetValue("prepayid", result.GetValue("prepay_id"));
                jsApiParam.SetValue("package", "Sign=WXPay");
                jsApiParam.SetValue("noncestr", Guid.NewGuid().ToString().Replace("-", ""));
                jsApiParam.SetValue("timestamp", Convert.ToInt64(WxPayApi.GenerateTimeStamp()));
                jsApiParam.SetValue("sign", jsApiParam.MakeSign());
                string parameters = jsApiParam.ToJson();
                return parameters;