A generic error occurred in GDI+. While saving a multiple image file

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C#

Please I need explanation why my code throw an error (A generic error occurred in GDI+.) while saving a multiple image pages. Sometime it would saved all the pages without any error. At times too it through error on the first. And sometime too the first and second pages would be saved but throw an error when saving any other pages.

public bool SaveMultipleImages(Image[] sourceImages, string targetFile)
{
    bool response = false;

    try
    {
        assignEncoder();

        // Merge individual Images into one Image
        // First page
        Image finalImage = sourceImages[0];

        finalImage.Save(targetFile, tifImageCodecInfo, tifEncoderParametersPage1);
        // All other pages

        int lastpage = sourceImages.Length;
        for (int i = 1; i < sourceImages.Length; i++)
        {
            finalImage.SaveAdd(sourceImages[i], tifEncoderParametersPageX);
        }
        // Last page
        
        finalImage.SaveAdd(tifEncoderParametersPageLast);

        finalImage.Dispose();

        response = true;
    }
    catch (Exception ex)
    {
        Console.WriteLine("Error saving merged file: " + ex.Message);
        throw new Exception("Error saving merged file: " + ex.Message);
    }

    return response;
}

private void assignEncoder()
{
   try
   {
       if (encoderAssigned == true)
           return;

       foreach (ImageCodecInfo ici in ImageCodecInfo.GetImageEncoders())
       {
           if (ici.MimeType == "image/tiff")
           {
               tifImageCodecInfo = ici;
           }
       }

       tifEncoderSaveFlag = System.Drawing.Imaging.Encoder.SaveFlag;
       tifEncoderCompression = System.Drawing.Imaging.Encoder.Compression;
       tifEncoderColorDepth = System.Drawing.Imaging.Encoder.ColorDepth;

       tifEncoderParameterMultiFrame = new EncoderParameter(tifEncoderSaveFlag, (long)EncoderValue.MultiFrame);
       tifEncoderParameterFrameDimensionPage = new EncoderParameter(tifEncoderSaveFlag, (long)EncoderValue.FrameDimensionPage);
       tifEncoderParameterFlush = new EncoderParameter(tifEncoderSaveFlag, (long)EncoderValue.Flush);
       tifEncoderParameterCompression = new EncoderParameter(tifEncoderCompression, (long)EncoderValue.CompressionRle);
       tifEncoderParameterLastFrame = new EncoderParameter(tifEncoderSaveFlag, (long)EncoderValue.LastFrame);
       tifEncoderParameter24BPP = new EncoderParameter(tifEncoderColorDepth, (long)24);
       tifEncoderParameter1BPP = new EncoderParameter(tifEncoderColorDepth, (long)8);

       // ******************************************************************* //
       // *** Have only 1 of the following 3 groups assigned for encoders *** //
       // ******************************************************************* //

       // Regular
       tifEncoderParametersPage1 = new EncoderParameters(1);
       tifEncoderParametersPage1.Param[0] = tifEncoderParameterMultiFrame;
       tifEncoderParametersPageX = new EncoderParameters(1);
       tifEncoderParametersPageX.Param[0] = tifEncoderParameterFrameDimensionPage;
       tifEncoderParametersPageLast = new EncoderParameters(1);
       tifEncoderParametersPageLast.Param[0] = tifEncoderParameterFlush;

       encoderAssigned = true;
   }
   catch (Exception ex)
   {
       Console.WriteLine(ex.Message);
       throw ex;
   }
}