Server Error in '/' Application.

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Line 160:
Line 161:            List<ListArticle> all = ConvertHelper<ListArticle>.ConvertToList(dt_main);
Line 162:            UInt32 _typeid = all.Find(a => a.Id == SafeConvert.ToUInt32(TypeID)).Topid;
Line 163:
Line 164:            List<ListArticle> root1 = all.FindAll(a => a.Reid == SafeConvert.ToUInt32(_typeid));

[NullReferenceException: 凯发体育下载_凯发k8ag_凯发手机下载]
   Info.Detail.Page_Load(Object sender, EventArgs e) in d:\www\jc.1190119.com\Article.aspx.cs:162
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207