[flexcoders] 3D Tree and flex 4.5

[method_air]

I'm getting this error when I click on an item from the 3D found at

http://activeden.net/item/3d-tree-20/full_screen_preview/15727

ArgumentError: Error #2109: Frame label Open not found in scene Open.
        at flash.display::MovieClip/gotoAndStop()
        at com.zerofractal::tree3D/openFolder()
        at com.zerofractal::tree3D/onItemPress()
        at flash.events::EventDispatcher/dispatchEventFunction()
        at flash.events::EventDispatcher/dispatchEvent()
        at 
org.papervision3d.core.utils::InteractiveSceneManager/dispatchObjectEvent()
        at 
org.papervision3d.core.utils::InteractiveSceneManager/handleMousePress()
        at flash.events::EventDispatcher/dispatchEventFunction()
        at flash.events::EventDispatcher/dispatchEvent()
        at 
mx.managers::SystemManager/mouseEventHandler()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\SystemManager.as:2924]

This error didn't occur when using Flex 3. Are there known issues 'argument 
error 2109' and flex 4.5?

Thanks,

Philip