[android help] (Android) ANTLRStringStream throwing exception

I've been trying to get ANTLR-3.5-complete.jar to work on an Android app, but I can't get it to work! Bart Kiers's answer HERE has helped me a lot, but I still can't get it to work.

I'm trying to make a Button that, when clicked, will validate whether the text in the EditText view is correct according to my grammar.g, but it doesn't matter whether the text I input is correct or not, my app always crashes when I click the button while instantiating the ANTLRStringStream. Here's what I have:

public void onClickVerify(View v) throws TypeNotPresentException {
    String source = "foobar";
    Log.e("TestDebug", "Instantiating views");
    TextView out = (TextView) findViewById(R.id.textView1);
    EditText in = (EditText) findViewById(R.id.editText1);
    try {
        Log.e("TestDebug", "Getting source from EditText");
        source = in.getText().toString();
        Log.e("TestDebug", "source = " + source);
        Log.e("TestDebug", "Instantiating stream");
        ANTLRStringStream stream = new ANTLRStringStream(source);
        Log.e("TestDebug", "Instantiating lexer");
        grammarLexer lexer = new grammarLexer(stream);
        Log.e("TestDebug", "Instantiating parser");
        grammarParser parser = new grammarParser(
                new BufferedTokenStream(lexer));
        Log.e("TestDebug", "Applying rule to parser");
        out.setText(source + " = " + !parser.failed());
    } catch (IllegalStateException ise) {
        out.setText("Exception caught");
    }
}

And here's what I see in the logs:

• Instantiating views


• Getting source from EditText


• source = test33


• Instantiating stream

And then the "Unfortunately, TestAntlrApp has stopped." window pops up.

EDIT: Here's more of my logcat.

java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3591)
at android.view.View.performClick(View.java:4084)
at android.view.View$PerformClick.run(View.java:16966)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at android.view.View$1.onClick(View.java:3586)
... 11 more
Caused by: java.lang.NoClassDefFoundError: org.antlr.runtime.ANTLRStringStream
at com.test.antlr.MainActivity.onClickVerify(MainActivity.java:89)

Something about not finding the class ANTLRStringStream class? However there seems to be no errors/warnings in the code and I can even see the class's hierarchy.

.

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