could not find image data or EI using itextsharp

Imports iTextSharp.text
Imports iTextSharp.text.pdf
Imports System.IO

Partial Public Class WebForm2
    Inherits System.Web.UI.Page
    Dim path As String = Server.MapPath("PDFs")

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If GetTextFromPDF(path + "/AOTD_SU_20131118_006.pdf") <> "" Then
            Me.Label1.Text = GetTextFromPDF(path + "/AOTD_SU_20131118_006.pdf")
        Else
            Me.Label1.Text = "The PDF has Images"
        End If
    End Sub

    Public Shared Function GetTextFromPDF(ByVal PdfFileName As String) As String
        Dim oReader As New iTextSharp.text.pdf.PdfReader(PdfFileName)
        Dim i As Integer
        Dim sOut = ""

        For i = 1 To oReader.NumberOfPages
            Dim its As New iTextSharp.text.pdf.parser.SimpleTextExtractionStrategy

            sOut &= iTextSharp.text.pdf.parser.PdfTextExtractor.GetTextFromPage(oReader, i, its)
        Next

        Return sOut
    End Function

End Class