Auth response error in whatapp api code

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ASP.NET

C#3.5

i have to get

Auth response error

What I have tried:

string from = "91xxxxxxxxxx";
string to = txtmobile.Text;//Sender Mobile
string msg = "Hello How are u??";//txtmessage.Text;

WhatsApp wa = new WhatsApp(from, "mypasword=", "myname", false,false);

wa.OnConnectSuccess += () =>
{
Response.Write("connect");

wa.OnLoginSuccess += (phoneNumber, data) =>
{
wa.SendMessage(to, msg);
Response.Write("Message Sent...");
};

wa.OnLoginFailed += (data) =>
{
Response.Write("login failed" + data);
};

wa.Login();
};

wa.OnConnectFailed += (ex) =>
{
Response.Write("connection failed");
};

wa.Connect();