Error 2497 (Report Name argument)

[hextupleyoodot]

When I try to run the sub procedure by clicking by command button "cmdPreview ," this error occurs:

Run-time error '2497':
The action or method require a Report Name argument.

I've transcribed the following code straight from a book from which I'm being taught, and to the best of my knowledge, it's been copied character for character:

Option Compare Database

Private strReport As String
Private Sub cmdPreview_Click()
Dim strSQL As String
Dim strWhere As String
If Not IsNull(txtDistributor) Then
   strWhere = strWhere & " AND DistributorName Like " & "'" & txtDistributor & "*'"
End If
If Not IsNull(txtContact) Then
   strWhere = strWhere & " AND ContactName Like " & "'" & txtContact & "*'"
End If
If Not IsNull(strWhere) Then
    strSQL = Mid$(strWhere, 6)
End If

[B]DoCmd.OpenReport strReport, acViewPreview, , strSQL[/B]
'Set the option group, combo boxes, and check box back to null
Clear_Controls:
    grpReports = Null
    txtDistributor = Null
    txtContact = Null
End Sub
Private Sub grpReports_AfterUpdate()
Select Case grpReports
  Case 1
   strReport = "rptVisitorsByDistributor"
End Select
End Sub

The part in bold is the line that apparently has the problem. The report name argument "strReport" is a string variable that was declared at the beginning of the code, and in the Private Sub at the bottom, strReport is supposed to be set to the value of the report name that is to be opened.

I'm relatively new to VBA (and programming in general), so any help would be great!

[hextupleyoodot]

Not sure what I did, but I got it to work. Something to do with the AfterUpdate event of the Option Group "grpReports " I think, but I'm not sure... but if it works, I won't question it.