“/”应用程序中的服务器错误。

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[NullReferenceException: 未将对象引用设置到对象的实例。]
   ASP.product_default_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in d:\wwwroot\website\product\Default.aspx:40
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +114
   System.Web.UI.Page.Render(HtmlTextWriter writer) +37
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4239