Solved: Visual Bsic 2008 with Word 2007 using .Execute(Replace:=Microsoft.Office.Interop.Word.WdReplace.wdReplaceAll)

In Visual Basic 2008 SP!
I am trying to open word 2007 with a template and replace a range with a dataset record.

I get an error at .Execute(Replace:=Microsoft.Office.Interop.Word.WdReplace.wdReplaceAll)

error is:
COMExeption was unhandled
This command is not available.

If I use try .. catch or on error the the replacement still happens. But I want to avoid this error from happening at all.

Is there a better way to construct the statement ?
I have tried 2 different methods to prevent this but have come up with the same result.

Private Sub rcPILetters_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles rcPILetters.SelectedIndexChanged
        If Not ThisApp.DONOTHING Then
            ' MsgBox(Me.rcPILetters.SelectedItem.Text & " : " & Me.rcPILetters.SelectedItem.Tag)
            '    ThisApp.DONOTHING = False
            'Else
            '    ThisApp.DONOTHING = False
            Dim word As New Microsoft.Office.Interop.Word.Application
            Dim doc As Microsoft.Office.Interop.Word.Document
 
            ' doc = word.Documents.Open(Me.rcPILetters.SelectedItem.Tag)
 
 
 
            Try
                doc = word.Documents.Add(Me.rcPILetters.SelectedItem.Tag)
                doc.Activate()
            Catch ex As Exception
                MsgBox("Error accessing Word document.", MsgBoxStyle.Critical)
                Exit Sub
            End Try
 
 
            Dim WordRange As Microsoft.Office.Interop.Word.Range
            Dim wdReplaceAll As Microsoft.Office.Interop.Word.WdReplace
 
            Try
                For Each WordRange In doc.StoryRanges
                    With WordRange.Find
                        .ClearFormatting()
                        .Text = "<<FirmName>>"
                        With .Replacement
                            .ClearFormatting()
                            .Text = MainDbPiForm.bsCustomerDetails.Current("FirmsName")
                        End With
                        .Execute(Replace:=wdReplaceAll, _
                               Format:=True, MatchCase:=True, _
                               MatchWholeWord:=True)
                    End With
 
 
                    With WordRange.Find
                        .Text = "<<Street>>"
                        .Replacement.Text = MainDbPiForm.bsCustomerDetails.Current("Street")
                        .Wrap = Microsoft.Office.Interop.Word.WdFindWrap.wdFindContinue
                        .Execute(Replace:=Microsoft.Office.Interop.Word.WdReplace.wdReplaceAll)
                    End With
 
                Next WordRange
            Catch ex As Exception
 
            End Try
 
            word.Visible = True
        End If
 
 
 
    End Sub

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