Excel popup window after using macro

This is the excel sheet i am using

When i run this macro

   Sub Value_fla()
    Dim k As Long
    With ActiveSheet
    k = .Cells(.Rows.Count, "D").End(xlUp).Row
    End With
    Range("D2:D" & k).Formula = Range("D2").Formula
    Range("F2:F" & k).Formula = Range("F2").Formula
    Range("G2:G" & k).Formula = Range("G2").Formula
    Range("D3:D" & k) = Range("D3:D" & k).Value
    Range("F3:F" & k) = Range("F3:F" & k).Value
    Range("G3:G" & k) = Range("G3:G" & k).Value
  End Sub

i got this popup window

and if i press cancel macro works fine. How can i get rid off this window??
any tips??

Excel version 2010