Newbie; If Statement problem in Access 2007

[BlackEyedPea]

Hi, I'm still learning, slowly, but hopefully at least getting a little better!

In essence all I want to do is find any barcodes in a field I have in a table that are only 7 digits long & add 6 0's to the front of barcode (therefore making those fields 13 digits long). I came up with the simple following which I thought might work...

Dim x6 As String
x6 = "000000"
If Len(AllTitles.[CountDigits] = 7) Then
  AllTitles.[CoBarcode] = x6 & AllTitles.[CoBarcode]
Else
  AllTitle.[CoBarcode] = AllTitle.[CoBarcode]
End If

I keep getting a runtime error 424 - Object required. Its bound to be something dead simple but I've searched all morning for an answer & I'm floundering.

Thanks a lot in advance of any advise.