[NullReferenceException: 개체 참조가 개체의 인스턴스로 설정되지 않았습니다.]
popup_Book_List_First.Page_Load(Object sender, EventArgs e) in d:\웹소스\학원홈페이지\popup\Book_List_First.aspx.cs:18
System.Web.UI.Control.OnLoad(EventArgs e) +105
System.Web.UI.Control.LoadRecursive() +67
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3784
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