“/”应用程序中的服务器错误。

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行 17:         ClassID = QueryLong("ClassID");
行 18:         modelT = new BLL.ProductType().GetModelBystrWhere("ClassID=" + ClassID);
行 19:         modelP = new BLL.ProductType().GetModelBystrWhere("ClassID=" + modelT.ParentID);
行 20:         modelSB = new BLL.SjAdvertising().GetModelBystrWhere("ClassID=144959613005987840 and IsPass=1");
行 21:         if (modelP != null)

[NullReferenceException: 未将对象引用设置到对象的实例。]
   product.Page_Load(Object sender, EventArgs e) in f:\usr\localuser\qyw2080250001\product\product.aspx.cs:19
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772