Why can't I get this to work?

Sub b9vlookup()
Dim theRange As Range
Dim lastrow&, firstRow&, x&
Set theRange = ActiveSheet.UsedRange
lastrow = theRange.Cells(theRange.Cells.Count).Row
firstRow = theRange.Cells(1).Row
For x = lastrow To firstRow Step -1
If InStr(1, Cells(x, 1), "Total") 0 Then
Cells(x + 2).FormulaR1C1 = "=VLOOKUP(R[3]C,Address!R[-4]C:R[15]C[3],2)"


End If
Next
End Sub

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Stacia