Flex报错之一

1、错误描述

TypeError: Error #1009: 无法访问空对象引用的属性或方法。
at com.gwtjs.components::DetailWindow/completeHandler()[D:\Adobe Flash Builder 4 Installer\demo\src\com\gwtjs\components\DetailWindow.mxml:25]
at com.gwtjs.components::DetailWindow/___DetailWindow_TitleWindow1_creationComplete()[D:\Adobe Flash Builder 4 Installer\demo\src\com\gwtjs\components\DetailWindow.mxml:5]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\core\UIComponent.as:12266]
at mx.core::UIComponent/set initialized()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\core\UIComponent.as:1577]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:759]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1072]

2、错误原因

3、解决办法