WhatsApp c# api“登录失败”;消息

我正在使用c# API的whatsapp

，当我试图发送消息到任何号码，消息"登录失败"显示给我!!

这是我的代码

  string to = textBox1.Text;
        string mes = richTextBox1.Text;
        string from = ******************";
        WhatsApp wa = new WhatsApp(from, Mypass, "56mmkjkjk", true, true);
        wa.OnConnectSuccess += () =>
        { 
            Console.WriteLine("Connected");
            wa.OnLoginSuccess += (phoneNumber, data) =>
            {
                Console.WriteLine("Connection success!");
                wa.SendMessage(to, "Hello World!");
                Console.WriteLine("Message sent!");
            };
            wa.OnLoginFailed += (data) =>
            {
               MessageBox.Show("Login failed: {0}", data);
            };
           wa.Login();
        };
        wa.OnConnectFailed += (ex) =>
        {
            Console.WriteLine("Connect failed: {0}", ex.StackTrace);
        };
        wa.Connect();
        Console.WriteLine("END");
        Console.ReadLine();

      WhatsApp wa = new WhatsApp(sender, password, nickname, true, true);
      wa.OnConnectSuccess += () => {
        Console.WriteLine("Connected");
        wa.OnLoginSuccess += (phoneNumber, data) => {
            Console.WriteLine("Connection success!");
            wa.SendMessage(target, "testing C# Api,sent via C#");
            Console.WriteLine("Message sent!");
        };
        wa.OnLoginFailed += (data) => {
            Console.WriteLine("Login failed: {0}", data);
        };
        wa.Login();
      };
      wa.OnConnectFailed += (ex) => {
        Console.WriteLine("Connect failed: {0}", ex.StackTrace);
      };
      wa.Connect();
      Console.WriteLine("END");