smslib для Java: пример ошибки отправки сообщения

Я установил библиотеку smslib на свой компьютер с Windows. Я следовал всем инструкциям на сайте smslib.org по настройке библиотеки. Но когда я пытаюсь запустить пример SendMessage, возникает ошибка.

    package examples.modem;

    import org.smslib.AGateway;
    import org.smslib.IOutboundMessageNotification;
    import org.smslib.Library;
    import org.smslib.OutboundMessage;
    import org.smslib.Service;
    import org.smslib.modem.SerialModemGateway;

    public class SendMessage
    {
        public void doIt() throws Exception
        {

            OutboundNotification outboundNotification = new OutboundNotification();
            System.out.println("Example: Send message from a serial gsm modem.");
            System.out.println(Library.getLibraryDescription());
            System.out.println("Version: " + Library.getLibraryVersion());
            SerialModemGateway gateway = new SerialModemGateway("modem.com1", "COM12", 115200, "Huawei", "E303");
            gateway.setInbound(true);
            gateway.setOutbound(true);
            gateway.setSimPin("0000");
            // Explicit SMSC address set is required for some modems.
            // Below is for VODAFONE GREECE - be sure to set your own!
            gateway.setSmscNumber("+xxxxxxxxxxx");
            Service.getInstance().setOutboundMessageNotification(outboundNotification);
            Service.getInstance().addGateway(gateway);
            Service.getInstance().startService();
            System.out.println();
            System.out.println("Modem Information:");
            System.out.println("  Manufacturer: " + gateway.getManufacturer());
            System.out.println("  Model: " + gateway.getModel());
            System.out.println("  Serial No: " + gateway.getSerialNo());
            System.out.println("  SIM IMSI: " + gateway.getImsi());
            System.out.println("  Signal Level: " + gateway.getSignalLevel() + " dBm");
            System.out.println("  Battery Level: " + gateway.getBatteryLevel() + "%");
            System.out.println();
            // Send a message synchronously.
            OutboundMessage msg = new OutboundMessage("xxxxxxxxx", "Hello from SMSLib!");
            Service.getInstance().sendMessage(msg);
            System.out.println(msg);
            // Or, send out a WAP SI message.
            //OutboundWapSIMessage wapMsg = new OutboundWapSIMessage("xxxxxxxx",  new URL("http://www.smslib.org/"), "Visit SMSLib now!");
            //Service.getInstance().sendMessage(wapMsg);
            //System.out.println(wapMsg);
            // You can also queue some asynchronous messages to see how the callbacks
            // are called...
            //msg = new OutboundMessage("xxxxxxxxxxx", "Wrong number!");
            //srv.queueMessage(msg, gateway.getGatewayId());
            //msg = new OutboundMessage("308888888888", "Wrong number!");
            //srv.queueMessage(msg, gateway.getGatewayId());
            System.out.println("Now Sleeping - Hit <enter> to terminate.");
            System.in.read();
            Service.getInstance().stopService();
        }

          public class OutboundNotification implements IOutboundMessageNotification
    {
        public void process(AGateway gateway, OutboundMessage msg)
        {
            System.out.println("Outbound handler called from Gateway: " + gateway.getGatewayId());
            System.out.println(msg);
        }
    }

    public static void main(String args[])
    {
        SendMessage app = new SendMessage();
        try
        {
            app.doIt();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

ошибка:

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
The method getInstance() is undefined for the type Service
The method getInstance() is undefined for the type Service
The method getInstance() is undefined for the type Service
The method getInstance() is undefined for the type Service
The method getInstance() is undefined for the type Service

at examples.modem.SendMessage.doIt(SendMessage.java:34)
at examples.modem.SendMessage.main(SendMessage.java:79)

Может ли кто-нибудь помочь мне с этим?