مشكلة فى تنفيذ هذا البرنامج

import javax.speech.*;

import javax.speech.synthesis.*;

import java.util.Locale;

public class HelloWorld {

public static void main(String args[]) {

try {

// Create a synthesizer for English

Synthesizer synth = Central.createSynthesizer(

new SynthesizerModeDesc(Locale.ENGLISH));

// Get it ready to speak

synth.allocate();

synth.resume();

// Speak the "Hello world" string

synth.speakPlainText("Hello, world!", null);

// Wait till speaking is done

synth.waitEngineState(Synthesizer.QUEUE_EMPTY);

// Clean up

synth.deallocate();

} catch (Exception e) {

e.printStackTrace();

}

}

}