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using RingCentralSDK

I am not able to get token.

when ever i try to authorize it gives error "Unauthorized for this grant type"

here is my code

Unauthorized for this grant type

using RingCentral;

using RingCentral.Http;

using System.Net.Http;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json;

/// <summary>

/// Summary description for Bulk_sms

/// </summary>

public class Bulk_sms

{

public string authid = "PZurrww4RtyPR1it0KyI9w", authtoken = "sJoF2hukSg637r-f3p2JwAbYUFC1ohQuO13obpG4MBYg", account = "+13133956838", password = "sagar@123";

public ApiResponse send_bulk(string src, string dest, string text)

{

try

{

src = "+" + src;

dest = "+" + dest;

var sdk2 = new SDK(authid, authtoken, SDK.Server.Sandbox, "SMS", "1");

sdk2.Platform.Login(account, "101", password, true);

//var body = text;

//var from = src;

//var to = dest;

//var jsonData = "{\"to\": [{\"phoneNumber\": \"" + to + "\"}]," +

// "\"from\": {\"phoneNumber\": \"" + from + "\"}," +

// "\"text\": \"" + text + "\" }";

//string SmsEndPoint = "/restapi/v1.0/account/~/extension/~/sms";

//Request request = new Request(SmsEndPoint, jsonData);

//ApiResponse response = sdk2.Platform.Post(request);

//return response;

var requestBody = new

{

text = text,

from = new { phoneNumber = src },

to = new object[] { new { phoneNumber = dest } }

};

var jsonString = JsonConvert.SerializeObject(requestBody);

var request = new Request("/restapi/v1.0/account/~/extension/~/sms", jsonString);

ApiResponse response = sdk2.Platform.Post(request);

return response;

}

catch (Exception)

{

throw;

}

}

Please Help Me...????????