TypeError: Error #1007: ??????????????????????????????????????
at mx.controls::LinkBar/createNavItem()
at mx.controls::NavBar/_setTargetViewStack()
at mx.controls::NavBar/checkPendingTargetStack()
at mx.controls::NavBar/commitProperties()
at mx.controls::LinkBar/commitProperties()
at mx.core::UIComponent/validateProperties()
at mx.managers::LayoutManager/validateClient()
at mx.managers::PopUpManagerImpl/addPopUp()
at mx.managers::PopUpManagerImpl/createPopUp()
at mx.managers::PopUpManager$/createPopUp()
at widgets.SystemManager::UserWidget/onSelectRole()
how to solve the problem?
