flex4模块中有DataGrid加载时报错
>
<fx:Declarations>
<!-- 将非可视元素（例如服务、值对象）放在此处 -->
</fx:Declarations>
<mx:DataGrid width="100%" height="100%" >
<mx:columns>
<mx:DataGridColumn headerText="编码" dataField="code" />
<mx:DataGridColumn headerText="名称" dataField="name" />
<mx:DataGridColumn headerText="单位" dataField="unit" />
<mx:DataGridColumn headerText="价格" dataField="price" />
<mx:DataGridColumn headerText="核算单位" dataField="hsunit" />
<mx:DataGridColumn headerText="规格" dataField="spec" />
<mx:DataGridColumn headerText="进料率" dataField="jinliao" />
<mx:DataGridColumn headerText="类型" dataField="goodstypename" />
</mx:columns>
</mx:DataGrid>
</mx:Module>
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.styles::StyleProtoChain$/initProtoChainForUIComponentStyleName()[E:\dev\4.x\frameworks\projects\framework\src\mx\styles\StyleProtoChain.as:356]
at mx.styles::StyleProtoChain$/initProtoChain()[E:\dev\4.x\frameworks\projects\framework\src\mx\styles\StyleProtoChain.as:171]
at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::initProtoChain()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:10446]
at mx.core::UIComponent/regenerateStyleCache()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:10509]
at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::addingChild()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:7213]
at mx.core::UIComponent/addChild()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:6910]
at mx.controls.listClasses::ListBase/createChildren()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3775]
at mx.controls::DataGrid/createChildren()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:1133]
at mx.core::UIComponent/initialize()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:7349]
at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:7241]
at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:3972]
at mx.core::Container/addChildAt()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:2616]
at mx.core::Container/addChild()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:2534]
at mx.core::Container/createComponentFromDescriptor()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:4392]
at mx.core::Container/createComponentsFromDescriptors()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:4181]
at mx.core::Container/createChildren()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:3187]
at mx.core::UIComponent/initialize()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:7349]
at mx.core::Container/initialize()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:3129]
at com.whlhy.lhymis.Modules::GoodsDGMD/initialize()
at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:7241]
at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:3972]
at mx.core::Container/addChildAt()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:2616]
at mx.core::Container/addChild()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\Container.as:2534]
at mx.modules::ModuleLoader/moduleReadyHandler()[E:\dev\4.x\frameworks\projects\framework\src\mx\modules\ModuleLoader.as:468]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at ModuleInfoProxy/moduleEventHandler()[E:\dev\4.x\frameworks\projects\framework\src\mx\modules\ModuleManager.as:1168]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at ModuleInfo/readyHandler()[E:\dev\4.x\frameworks\projects\framework\src\mx\modules\ModuleManager.as:812]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::FlexModuleFactory/update()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\FlexModuleFactory.as:433]
at mx.core::FlexModuleFactory/docFrameHandler()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\FlexModuleFactory.as:582]
at mx.core::FlexModuleFactory/docFrameListener()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\FlexModuleFactory.as:126]
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.controls.listClasses::ListBase/updateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:4336]
at mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\dataGridClasses\DataGridBase.as:682]
at mx.controls::DataGrid/updateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:1741]
at mx.controls.listClasses::ListBase/validateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3966]
at mx.managers::LayoutManager/validateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:663]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:718]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1072]
