MICROSOFT认知面板API PERSONGROUP

Question

我尝试使用MS Cognitive面部API创建人员组，但我不断收到错误消息＆＃34; {\＆＃34;错误\＆＃34;：{\＆＃34;代码\＆＃34;：\＆＃34; BadArgument \＆＃34;，\＆＃34;消息\＆＃34;：\＆＃34;请求正文无效。\＆＃34;}}＆＃ 34 ;.我知道这是我身体的问题。以下是我的源代码。如果有人能帮我解决这个问题会很高兴。

    public async Task<dynamic> CREATEPERSONGROUP()
    {
        var get = await MakeRequest();
        var response = get;
        return Json(data: response);
    }

    static async Task<string> MakeRequest()
    {
        var client = new HttpClient();
        var queryString = HttpUtility.ParseQueryString(string.Empty);

        // Request headers
        client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key",           
           subscriptionKey);

        var uri = "https://westcentralus.api.cognitive.microsoft.com
        /face/v1.0/persongroups/rwtfacesearchgroup1?" + queryString;

        HttpResponseMessage response;

        // Request body
        byte[] byteData = Encoding.UTF8.GetBytes("name: searching");

        using (var content = new ByteArrayContent(byteData))
        {
            content.Headers.ContentType = new 
            MediaTypeHeaderValue("application/json");
            response = await client.PutAsync(uri, content);
            string contentString = await 
            response.Content.ReadAsStringAsync();
            return (contentString);
        }
    }