아래와 같은 메세지가 뜹니다.
어떤 오류인가요?
System.Exception: Exception handled in FpSpread.WndProc ---> System.InvalidCastException: "10013216.hwp" 문자열에서 'Date' 형식으로 변환할 수 없습니다.
  위치: Microsoft.VisualBasic.CompilerServices.Conversions.ToDate(String Value)
  위치: Form_Main.Fp1_CellClick(Object sender, CellClickEventArgs e)
  위치: FarPoint.Win.Spread.FpSpread.OnCellClick(CellClickEventArgs e)
  위치: FarPoint.Win.Spread.FpSpread.a(SpreadView A_0, Int32 A_1, Int32 A_2, Int32 A_3, Int32 A_4, MouseButtons A_5, Boolean A_6, Boolean A_7, Boolean A_8)
  위치: FarPoint.Win.Spread.SpreadView.a(Int32 A_0, Int32 A_1, MouseEventArgs A_2)
  위치: FarPoint.Win.Spread.SpreadView.g(MouseEventArgs A_0)
  위치: FarPoint.Win.Spread.FpSpread.OnMouseDown(MouseEventArgs e)
  위치: System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
  위치: System.Windows.Forms.Control.WndProc(Message& m)
  위치: FarPoint.Win.Spread.FpSpread.WndProc(Message& m)
  --- 내부 예외 스택 추적의 끝 ---
  위치: FarPoint.Win.Spread.FpSpread.WndProc(Message& m)
  위치: System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
  위치: System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
  위치: System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)