Help with a pie-chart format in a VBA code

Hi all,

My doubt is probably simple for most of you, but I'm pretty new at this so, better to ask you than keep looking through google.

I've edited a code in word to create a pie chart and format it according the name of the colors using the select case. When this code is run in a excel 2007 it runs pretty good, but once I write the same code in a excel 2003, it gives me a runtime error which say: "Object variable or With block variable not set". below in the code I show where this message appears.

My problem is right in this section, how do I solve this issue in excel 2003, once in excel 2007 is working properly.

Thanks in advance

The code is:

Sub Pie_Chart()
'Choosing what type of chart
    ActiveSheet.Shapes.AddChart.Select
    ActiveChart.ChartType = xl3DPieExploded
    ActiveChart.ApplyLayout (6)
    ActiveChart.ChartArea.Select
'Creating the Chart
  With ActiveChart.SeriesCollection.NewSeries
        .Name = ActiveSheet.Range("C2")
        .Values = ActiveSheet.Range("C8:C10")
        .XValues = ActiveSheet.Range("B8:B10")
  End With
'Placing the Chart
  With ActiveChart.Parent
    .Left = 1
    .Width = 215
    .Top = 267
    .Height = 150
  End With
'Formating the Chart
   Dim iPoint As Long, nPoint As Long
  With ActiveChart.SeriesCollection(1).Select 'THE RUN TIME ERROR ON EXCEL 2003 COMES RIGHT HERE
     For iPoint = 1 To .Points.Count
          Select Case WorksheetFunction.Index(.XValues, iPoint)
                 Case "Yellow"
                    .Points(iPoint).Interior.ColorIndex = 6 ' Yellow
                 Case "Red"
                    .Points(iPoint).Interior.ColorIndex = 3 ' Red
                 Case "Green"
                    .Points(iPoint).Interior.ColorIndex = 4 ' Green
           End Select
       Next
   End With
End Sub