Parameter is Not Valid Error

Question

We are working on Integration project which will get information from SOAP and output getting in byte. now i am trying to write it into memory stream to convert to PDF, but i am getting error message as below

 

"Parameter is Not Valid"

 

public string getimage(string s)
        {
            // var bytes = s;


            byte[] bytes = Convert.FromBase64String(s);
              Image image1;
            try
            {
                  using (var ms = new MemoryStream(bytes, 0, bytes.Length))

                {

                    ms.Seek(0, SeekOrigin.Begin);
                    ms.Position = 0;

                    using (image1 = Image.FromStream(ms, true))
                    {


                    using (Image imageFile = image1)
                    {
                        FrameDimension frameDimensions = new FrameDimension(
                            imageFile.FrameDimensionsList[0]);

                        int frameNum = imageFile.GetFrameCount(frameDimensions);
                        string[] jpegPaths = new string[frameNum];
                        PdfDocument doc = new PdfDocument();
                        for (int frame = 0; frame < frameNum; frame++)
                        {
                            imageFile.SelectActiveFrame(frameDimensions, frame);
                            doc.Pages.Add(new PdfPage());
                            XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[frame]);
                            using (Bitmap bmp = new Bitmap(imageFile))
                            {
                                using (var ms11 = new MemoryStream())
                                {
                                    bmp.Save(ms11, System.Drawing.Imaging.ImageFormat.Png);
                                    XImage img = XImage.FromStream(ms11);

                                    PdfPage page = new PdfPage();

                                    xgr.DrawImage(img, 0, 0, 595, 842);
                                }
                            }
                        }

                        byte[] fileContents = null;
                        using (MemoryStream stream = new MemoryStream())
                        {
                            doc.Save(stream, true);
                            fileContents = stream.ToArray();
                        }

                        TempData["file"] = Convert.ToBase64String(fileContents);
                        doc.Close();

                        return Convert.ToBase64String(fileContents);
                    }
                }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }

Can someone suggest me what is wrong here here is my code as well. Getting error in row number 10.