Invoke fireEvent in Native Android module and Listening it from Titanium Js

I want to fire an event from native android module and listen in on Titanium. I created a class in native module call Detector extending Kroll Proxy.

package com.detect.test;
import org.appcelerator.kroll.KrollProxy;
public class Detector extends KrollProxy {
    @Override
    public boolean fireEvent(String event, Object data) {
        // TODO Auto-generated method stub
        return super.fireEvent(event, data);
    }   
 
}

In the android Kroll module extended class i created kroll method firing the event.

@Kroll.method
    public void detectDevice() {
        Detector newDectector = new Detector();
        KrollDict newKrollDict = new KrollDict({device:"Detected"});
        newDectector.fireEvent("deviceFound",newKrollDict);     
    }

I'm implementing a listener in the Titanium JS.

Ti.App.addEventListener('deviceDetected', function(e) {
            alert(e.device);
});

However this doesn't works. It throes force close on the app. Am I doing this right?