Problem:
I'm getting this "TypeError: Error #1009: Cannot access a property or method of a null object reference."
What's happening in the flash file is that I've got a movieclip inside a movieclip and when you roll over one of the movieclips the alpha setting for the movieclip inside the initial movieclip is set to 1, then it transitions out back to 0 over a period of time.

var myTween:Tween = new Tween(event.target.parent.ripple_mc, "alpha", Strong.easeOut, 0, 100, 24, false);

It seems to be random but eventually after rolling over the several movieclips on the stage the error comes up. Sometimes the alpha setting stops working and will continue to be visible even though it should have stopped and be invisible after 24 frames.

Would love some help on this.

Cheers