Public Sub Image2Pdf(filename As String)
        '=======Source is a scanned .jpg file that works in the demo "ExtractTextFromImage()"=========
        Dim sourceImage As String = filename
        '========tessdata is located in the website root dir===========
        Dim TessDataPath As String = Server.MapPath("~/")
        Dim outputFile As String = Server.MapPath("~/tempimages/") & "output"

        Using api = OcrApi.Create()
            api.Init(Languages.English, TessDataPath)
            'Create the renderer to PDF file output. The extension will be added automatically
            Using renderer = OcrPdfRenderer.Create(outputFile, TessDataPath)
                '======="output.pdf is created in output directory, however it remains empty=====
                renderer.BeginDocument("Title")
                '=======Error occurs on next line=======
                api.ProcessPages(sourceImage, Nothing, 0, renderer)
                renderer.EndDocument()
            End Using
        End Using
    End Sub