未将对象引用设置到对象的实例。

[NullReferenceException: 未将对象引用设置到对象的实例。] ASP.news_commentv3_aspx.__RenderHead1(HtmlTextWriter __w, Control parameterContainer) in e:\WebSite\NEWPK_20090626\news\CommentV3.aspx:21 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130 System.Web.UI.HtmlControls.HtmlHead.RenderChildren(HtmlTextWriter writer) +27 System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +48 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +149 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +245 System.Web.UI.Page.Render(HtmlTextWriter writer) +39 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +149 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5362