服务器端创建会话 报系统繁忙

access_token = (string)JObject.Parse(acctonken)["access_token"];
            jobjpar.Add("access_token", access_token);
            JArray ja = new JArray();
            ja.Add("01066120113718");
            ja.Add("16");
            jobjpar.Add("name", "钉钉自动化");
            jobjpar.Add("owner", "01066120113718");
            //jobjpar.Add("useridlist","['01066120113718','16']");
            jobjpar.Add("useridlist",ja.ToString());
            aa=Post("https://oapi.dingtalk.com/chat/create?access_token=" + access_token, jobjpar.ToString());