[NullReferenceException: 未将对象引用设置到对象的实例。]
FxOpen.BizRule.Cart.Add(Int32 bookId) +475
FxWeb.Book.ShopCart.PageInit() +123
FxWeb.Book.ShopCart.Page_Load(Object sender, EventArgs e) +79
System.Web.UI.Control.OnLoad(EventArgs e) +107
System.Web.UI.Control.LoadRecursive() +89
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1532
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