Quickblox：使用c＃在发送推送通知期间出错（远程服务器返回错误：（422）Unprocessable Entity。）

Question

我在使用c＃发送推送通知时收到错误（远程服务器返回了error: (422) Unprocessable Entity.)。我正在向所有可能的设备发送notification。

然后我在这一行收到错误

HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse(); 

以下是代码：

try
{   
    String token = GetToken();
    HttpWebRequest httpWReq;
    httpWReq = (HttpWebRequest)WebRequest.Create(System.Configuration.ConfigurationManager.AppSettings["QuickUrl"].ToString().Trim() + "events.xml");

    byte[] plainTextBytes = System.Text.Encoding.UTF8.GetBytes("Pending Request Notification");
    string base64Msg = System.Convert.ToBase64String(plainTextBytes);

    String postData = "event[notification_type]=push";
    postData += "&event[environment]=development";               
    postData += "&event[message]=" + base64Msg;                
    postData += "&event[ios_badge]=" + userPendingFriendRequestCount;
    postData += "&event[ios_sound]=default";
    postData += "&event[user][ids]={" + QuickBloxID + "}";

    ASCIIEncoding encoding = new ASCIIEncoding();
    byte[] data = encoding.GetBytes(postData);
    httpWReq.UserAgent = ".NET Framework Test Client";
    httpWReq.Method = "POST";
    httpWReq.ContentLength = data.Length;
    httpWReq.Headers["QuickBlox-REST-API-Version"] = "0.1.0";
    httpWReq.Headers["QB-Token"] = token;
    using (Stream stream = httpWReq.GetRequestStream())
    {
        stream.Write(data, 0, data.Length);
    }

    HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse();//The remote server returned an error: (422) Unprocessable Entity.
    string responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
    XDocument xmlDoc = XDocument.Parse(responseString);
    IsNotificationSent = true;

}
catch (Exception ex)
{
    // new ErrorLogger().LogException(ex, "QBBAL-->addupdateDriverUserInQuickBlox");
}