UIMovieClip TypeError: Error #1009:...

Hi All,

聽聽聽 I am getting the following error

TypeError: Error #1009:聽 Cannot access a property or method of a null object reference.

聽聽聽聽聽 at mx.flash::UIMovieClip/removeFocusEventListeners()[D:\flexworkspace\stand-show\s rc\mx\flash\UIMovieClip.as:2466]
聽聽聽聽聽 at mx.flash::UIMovieClip/focusOutHandler()[D:\flexworkspace\stand-show\src\mx\flas h\UIMovieClip.as:2509]
聽聽聽聽聽 at flash.display::Stage/set focus()
聽聽聽 ..............................

聽聽聽聽 .........................

聽聽聽聽 ............................

I use flex sdk3.2

help ! How should I go about solving this problem?

Thanks!