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Error adding blank pages to PDF


I’m using Aspose.PDF for .NET, version
I want to convert TIFF to PDF so I’m adding pages and add the file to them. Since the PDFs I’m trying to use are compressed in Old-Style JPEG and the System library doesn’t support them, I’m using Magick.NET to create a new image but with the new JPEG compression, then add that one into the PDF page.

But I get this error:
image.png (93.1 KB)

My code is:

            public void TifToPdf3(string dest, string[] e) {  

            MagickReadSettings magickReadSettings = new MagickReadSettings();
            magickReadSettings.Compression = ImageMagick.CompressionMethod.JPEG;
            magickReadSettings.Format = MagickFormat.Tiff;

            for (int i = 0; i < e.Length; i++)
                bool isError = false;
                    using (MagickImageCollection collection = new MagickImageCollection(e[i], magickReadSettings))
                        string pastatif = AppDomain.CurrentDomain.BaseDirectory + "temporario\\" + Path.GetFileNameWithoutExtension(e[i]);
                        if (!Directory.Exists(pastatif)) Directory.CreateDirectory(pastatif);

                        Aspose.Pdf.Document doc = new Aspose.Pdf.Document();
                        // Add a page to pages collection of document

                        for (int y = 0; y < collection.Count; y++)
                            Aspose.Pdf.Page page = doc.Pages.Add();
                            int activePage = y + 1;
                            string file = pastatif + "\\" + Path.GetFileNameWithoutExtension(e[i]) + " -Pagina " + activePage + ".tif";
                            MagickImage image = new MagickImage(collection[y]);
                            image.Quality = 50;
                            image.Format = MagickFormat.Tiff;
                            image.Write(file, MagickFormat.Tif);

                            FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read);
                            byte[] tmpBytes = new byte[fs.Length];
                            fs.Read(tmpBytes, 0, int.Parse(fs.Length.ToString()));

                            MemoryStream mystream = new MemoryStream(tmpBytes);
                            Bitmap bm = new Bitmap(file);

                            page.PageInfo.Margin.Bottom = 0;
                            page.PageInfo.Margin.Top = 0;
                            page.PageInfo.Margin.Left = 0;
                            page.PageInfo.Margin.Right = 0;

                            page.CropBox = new Aspose.Pdf.Rectangle(0, 0, bm.Width, bm.Height);
                            Aspose.Pdf.Image image1 = new Aspose.Pdf.Image();
                            image1.ImageStream = mystream;

                        doc.Save(dest + Path.GetFileNameWithoutExtension(e[i]) + ".PDF");
                catch(Exception ex)
                    MessageBox.Show(ex.ToString(), "Erro", MessageBoxButtons.OK);
                    isError = true;
                if (isError) continue;


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