UIMovieClip TypeError: Error #1009:...

Hi All,

?I am getting the following error

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

?at mx.flash::UIMovieClip/removeFocusEventListeners()[D:\flexworkspace\stand-show\s rc\mx\flash\UIMovieClip.as:2466]
?at mx.flash::UIMovieClip/focusOutHandler()[D:\flexworkspace\stand-show\src\mx\flas h\UIMovieClip.as:2509]
?at flash.display::Stage/set focus()
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I use flex sdk3.2

help ! How should I go about solving this problem?

Thanks!