flex报的错误，完整的错误如下：
ReferenceError: Error #1065: 变量 未定义。 at global/flash.utils::getDefinitionByName() at mx.utils::DescribeTypeCache$/describeType()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\utils\DescribeTypeCache.as:95] at mx.utils::ObjectUtil$/getClassInfo()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\utils\ObjectUtil.as:829] at mx.controls::DataGrid/generateCols()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:2407] at mx.controls::DataGrid/collectionChangeHandler()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:4132] at mx.controls.listClasses::ListBase/set dataProvider()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:1827] at mx.controls::DataGrid/set dataProvider()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:1334] at mx.core::Container/createComponentFromDescriptor()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3595] at mx.core::Container/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3493] at mx.containers::Panel/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\containers\Panel.as:1528] at mx.core::Container/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2589] at mx.containers::Panel/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\containers\Panel.as:1056] at mx.core::UIComponent/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5370] at mx.core::Container/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2526] at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5267] at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3305] at mx.core::Container/addChildAt()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2217] at mx.core::Container/addChild()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2140] at mx.core::Container/createComponentFromDescriptor()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3681] at mx.core::Container/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3493] at mx.core::Container/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2589] at mx.core::UIComponent/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5370] at mx.core::Container/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2526] at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5267] at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3305] at mx.core::Container/addChildAt()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2217] at mx.core::Container/addChild()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2140] at mx.core::Container/createComponentFromDescriptor()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3681] at mx.core::Container/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3493] at mx.core::Container/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2589] at mx.core::UIComponent/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5370] at mx.core::Container/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2526] at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5267] at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3305] at mx.core::Container/addChildAt()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2217] at mx.core::Container/addChild()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2140] at mx.core::Container/createComponentFromDescriptor()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3681] at mx.core::Container/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3493] at mx.containers::Panel/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\containers\Panel.as:1528] at mx.core::Container/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2589] at mx.containers::Panel/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\containers\Panel.as:1056] at mx.core::UIComponent/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5370] at mx.core::Container/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2526] at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5267] at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3305] at mx.core::Container/addChildAt()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2217] at mx.core::Container/addChild()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2140] at mx.core::Container/createComponentFromDescriptor()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3681] at mx.core::Container/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3493] at mx.core::Container/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2589] at mx.core::UIComponent/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5370] at mx.core::Container/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2526] at mx.core::Application/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Application.as:846] at CloudRandomForest/initialize()[E:\fansy_work\project\caic-ria\src\CloudRandomForest.mxml:0] at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:2009] at mx.managers::SystemManager/initializeTopLevelWindow()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:3234] at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::docFrameHandler()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:3064] at mx.managers::SystemManager/docFrameListener()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:2916] TypeError: Error #1009: 无法访问空对象引用的属性或方法。 at mx.containers::Panel/commitProperties()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\containers\Panel.as:1159] at mx.core::UIComponent/validateProperties()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5807] at mx.managers::LayoutManager/validateProperties()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:539] at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:659] at Function/http://adobe.com/AS3/2006/builtin::apply() at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8628] at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8568]
下面是一个相对合理的解释。
针对一个MXML文件：
方式一： private var myId:String ; 或者 [Bindable] private var myId:String ;
方式二： private var myId:String =""; 或者 [Bindable] private var myId:String =""；
方式三： private var myId:String = null; 或者 [Bindable] private var myId:String = null;
这三种方式都不行；
可以使用的是 在前面加上// 也就是把它们去掉，这里需要郑重说明的一点是 myId变量在整个页面的其他地方没有用到，所以才出现了这个问题。纠结呀，搞了好久，才发现这个问题。如果在下面的界面中用到了myId这个变量，那么就不会出现这个问题了。看来编程也不是随便的复制别人的代码，还要每个变量都推敲一下呀。
分享，成长，快乐
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Error #1065: 变量 未定义 global/flash.utils::getDefinitionByName()
原文：http://blog.csdn.net/fansy1990/article/details/19071547