Invalid Row index

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VB

ASP.NET

Hello,
I am facing an issue while saving the farpoint grid. At the first opening time of page view state of FP grid loads 3 rows as default rows. When I save the grid number of rows are 7.
When I open the page saving once it works fine loads the grid with seven rows.Now when I named changes in the grid data and saves the grid first it goes to loadviewstate it loads viewstate with 3 rows and throws error because this time grid has 7 rows binded to grid as I am saving the grid second time.
Code for more clarity:

Private Sub FpVal_SaveOrLoadSheetState(ByVal sender As Object, ByVal e As FarPoint.Web.Spread.SheetViewStateEventArgs) Handles FpVal.SaveOrLoadSheetState
            Try
                If (e.IsSave) Then
                    Session(e.SheetView.SheetName) = e.SheetView.SaveViewState()
                Else
                    e.SheetView.LoadViewState(Session(e.SheetView.SheetName))
                End If
                e.Handled = True
            Catch ex As Exception
                Dim obj(0) As Object
                obj(0) = ex
                ExceptionFlag.DynamicInvoke(obj)
            End Try

        End Sub

I get: Invalid Row index 3 (must be between -1 and 2)