TypeError: Error #2007: 参数 child 不能为空，是什么意思呢？
atflash.display::DisplayObjectContainer/addChildAt()atfl.controls::BaseButton/fl.cont...
at flash.display::DisplayObjectContainer/addChildAt()
at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
at fl.controls::LabelButton/fl.controls:LabelButton::draw()
at fl.controls.listClasses::ImageCell/fl.controls.listClasses:ImageCell::draw()
at fl.core::UIComponent/drawNow()
at fl.controls::TileList/fl.controls:TileList::drawList()
at fl.controls::TileList/fl.controls:TileList::draw()
at fl.core::UIComponent/::callLaterDispatcher() 展开
at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
at fl.controls::LabelButton/fl.controls:LabelButton::draw()
at fl.controls.listClasses::ImageCell/fl.controls.listClasses:ImageCell::draw()
at fl.core::UIComponent/drawNow()
at fl.controls::TileList/fl.controls:TileList::drawList()
at fl.controls::TileList/fl.controls:TileList::draw()
at fl.core::UIComponent/::callLaterDispatcher() 展开
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