FreeTTS unable to find any voice

I am trying to use FreeTTS, here is the code:

import com.sun.speech.freetts.Voice;
import com.sun.speech.freetts.VoiceManager;

public class FreeTTSVoice {

public static final String VOICE_ALAN = "alan";
public static final String VOICE_KEVIN = "kevin";
public static final String VOICE_KEVIN16 = "kevin16";

private Voice voice;

public FreeTTSVoice(String voiceName) {

    VoiceManager voiceManager = VoiceManager.getInstance();
    voice = voiceManager.getVoice(voiceName);

    if (voice == null) {
        System.err.println(
            "Cannot find a voice named "
            + voiceName + ".  Please specify a different voice.");
        System.exit(1);
    }
}

public void speak(String msg) {
    voice.speak(msg);

}

public void open() {
    voice.allocate();
}

public void close() {
    voice.deallocate();
}

public static void main(String[] args) {
    System.setProperty("freetts.voices", "com.sun.speech.freetts.en.us.cmu_us_kal.KevinVoiceDirectory");

    FreeTTSVoice me = new FreeTTSVoice(FreeTTSVoice.VOICE_KEVIN);
    me.open();
    me.speak("Hello java is smart. isn't is?");
    me.close();
}

}

It compiles fine, but throws the following runtime-error:

    pkswatch@neurals:~/dev/java/speech/viame-speech$ javac FreeTTSVoice.java
    pkswatch@neurals:~/dev/java/speech/viame-speech$ java FreeTTSVoice 
    Exception in thread "main" java.lang.Error: Unable to load voice directory.java.lang.ClassNotFoundException: com.sun.speech.freetts.en.us.cmu_us_kal.KevinVoiceDirectory
    at com.sun.speech.freetts.VoiceManager.getVoiceDirectories(VoiceManager.java:198)
    at com.sun.speech.freetts.VoiceManager.getVoices(VoiceManager.java:110)
    at com.sun.speech.freetts.VoiceManager.getVoice(VoiceManager.java:502)
    at FreeTTSVoice.<init>(FreeTTSVoice.java:15)
    at FreeTTSVoice.main(FreeTTSVoice.java:39)

I am using: java version "1.6.0_24"

OpenJDK Runtime Environment (IcedTea6 1.11.3) (6b24-1.11.3-1ubuntu0.12.04.1)

OpenJDK Server VM (build 20.0-b12, mixed mode)

FreeTTS version 1.2.2

Why is it giving that error? Please help

Probably some jars were not linked correctly.. Started working as soon as i built the project using netbeans!

Thanks guys (@netbeans).. u saved my day! :)

For those who might be having the same problem, use netbeans to avoid hassle of libraries.

1. add lib/freetts.jar from "lib" folder in "freetts-1.2.2-src.zip" (downloadable from sf.net)
2. add jdk folder (if not already listed) to project libraries
3. You are done! now run the code.