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 InstallerdemosrccomgwtjscomponentsDetailWindow.mxml:25]
at com.gwtjs.components::DetailWindow/___DetailWindow_TitleWindow1_creationComplete()[D:Adobe Flash Builder 4 InstallerdemosrccomgwtjscomponentsDetailWindow.mxml:5]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:dev4.0.0frameworksprojectsframeworksrcmxcoreUIComponent.as:12266]
at mx.core::UIComponent/set initialized()[E:dev4.0.0frameworksprojectsframeworksrcmxcoreUIComponent.as:1577]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:dev4.0.0frameworksprojectsframeworksrcmxmanagersLayoutManager.as:759]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:dev4.0.0frameworksprojectsframeworksrcmxmanagersLayoutManager.as:1072]

2、错误原因

3、解决办法