Filthy Rich Clients - Problem with propertySetter in ObjectModifier

I'm trying to use the Animator class from the framework, from inside my JFrame I do:

@Override
public void mouseClicked(MouseEvent e) {
    super.mouseClicked(e);
    Animator animator = new Animator(100);
    animator.addTarget(new PropertySetter(AnimatedIcon.this, "alpha", 0.0f));
    animator.setAcceleration(0.2f);
    animator.setDeceleration(0.4f);
    animator.start();
}
});

But as a result I get the following error: "Problem with propertySett开发者_开发问答er in ObjectModifier Problem invoking method in setValue:java.lang.NullPointerException" Please help, I tried many things to resolve it, without success. (AnimatedIcon is an outer class)

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How about this?

super.mouseClicked(e);

PropertySetter setter = new PropertySetter(AnimatedIcon.this, "alpha", 0.0f));
Animator animator = new Animator(100, setter);
animator.setAcceleration(0.2f);
animator.setDeceleration(0.4f);
animator.start();

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Thanks everyone, I found out my mistake: the class was not declared as public, but as default instead. Since I'm working with framework that use annotations, and the framework is not from the same package, the non-public class did not allow to use its' methods from the outside.