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System.IO.IOException: Read pdf error:Trailer object is null.: v4.6.0.0

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Creating a PDF, I have a function that Adds a Footer below, at the bolded line, I am getting the error:
System.IO.IOException: Read pdf error:Trailer object is null.: v4.6.0.0

Any ideas what can be causing this?  Very time sensitive issue as this is on our production server.  Thank you.

Public Sub AddFooter(ByVal strFileIn As FileStream)
        Dim strFileOut As FileStream = strFileIn ' Output file can't be nothing, so I assign it a value to be overwritten.

        Dim txt As New FormattedText()

        'TODO: If possible, replace text with image to get the superscript "SM" in place.
        ' Footer FormattedText Object
        Dim ft As New FormattedText("AgendaManager – Powered by the CAIU", _
                                    System.Drawing.Color.FromArgb(255, 207, 207, 207), _
                                    Kit.FontStyle.HelveticaBold, _
                                    EncodingType.Winansi, _
                                    True, _
                                    10)

        ' PdfFileStamp type object
        Dim filestamp As New PdfFileStamp(strFileIn, strFileOut)

        filestamp.AddFooter(ft, 44, 0, 72)

        filestamp.Close()
        strFileIn.Close()
        strFileOut.Close()

    End Sub

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