Flex強制類型轉換錯誤

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1、錯誤描寫敘述

TypeError: Error #1034: 強制轉換類型失敗:無法將 [email protected] 轉換為 mx.controls.listClasses.IListItemRenderer。at mx.controls.dataGridClasses::DataGridColumn/http://www.adobe.com/2006/flex/mx/internal::getMeasuringRenderer()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\controls\dataGridClasses\DataGridColumn.as:1892]at mx.controls::DataGrid/commitProperties()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\controls\DataGrid.as:1925]at mx.core::UIComponent/validateProperties()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\core\UIComponent.as:7772]at mx.managers::LayoutManager/validateProperties()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:572]at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:700]at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1072]

2、錯誤原因

3、解決的方法

Flex強制類型轉換錯誤