Error 1069 when Tweening 3D on timeline 'property null not found'

1

Hi there, I am trying to do a simple 3d tween on the timeline. I am doing this in the simplest way possible but Flash is throwing an error. Here is what I am doing:

-draw a rectangle
-convert to movieclip
-right-click and choose ‘create motion tween’
-select the 3d rotation tool and change the y rotation
-publish the swf

When I publish the swf I get the error message on every frame:

ReferenceError: Error #1069: Property null not found on fl.motion.KeyframeBase and there is no default value.
	at fl.motion::KeyframeBase/getValue()
	at fl.motion::MotionBase/getValue()
	at fl.motion::Animator3D/setTime3D()
	at fl.motion::AnimatorBase/set time()
	at fl.motion::AnimatorBase$/processCurrentFrame()
	at fl.motion::AnimatorBase$/parentEnterFrameHandler()

I’ve searched the forums, have googled extensively but can’t find any answers. There is no code in this project whatsoever and I have restarted my computer in case there was some weird compiler issue.

Any responses / help much appreciated.

Thanks,
Hectors