Android - App crashes on Pre-Lollipop devices

Question

My app is running well on Lollipop devices but it keep crashing on prior to version Lollipop. I have simply implemented a banner add in my application with the following code th

Answer 1

After expanding more than a hour on problem, I found that I have to do some modification in MyApplication Class like this:

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        // register with Active Android
        ActiveAndroid.initialize(this);
    }

    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
        MultiDex.install(this);
    }
}

I have overriden the attachbaseContext method and all works fine now.