发生GDI+一般性错误，请问怎么办，请高人帮忙谢谢，分没55555555555

    /// <summary>
    /// 保存小图（文字水印）
    /// </summary>
    /// <param name="savePath">保存小图的完整路径</param>
    /// <param name="w">小图宽度</param>
    /// <param name="h">小图高度</param>
    /// <param name="Title">画在图上的水印文字</param>
    /// <param name="fontsize">文字的大小</param>
    /// <param name="ImagePath">原图的完整路径</param>
    public bool SaveSmallImg(string savePath, int w, int h, string Title, int fontsize, string ImagePath)
    {
        if (ImagePath == null || savePath == null)
        {
            return false;
        }
        Bitmap Img = new Bitmap(ImagePath);
        int w0 = 0;
        int h0 = 0;
        if (Img.Width / Img.Height >= w / h  )
        {
            h0 = h;
            w0 = h0 * Img.Width / Img.Height;
        }
        else
        {
            w0 = w;
            h0 = w0 * Img.Height / Img.Width;
        }
        Bitmap bit = new Bitmap(w0, h0);
        Graphics gp = Graphics.FromImage(bit);
        gp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        gp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        gp.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        gp.Clear(System.Drawing.Color.Transparent);
        gp.DrawImage(Img, new Rectangle(0, 0, w0, h0));        gp.SmoothingMode = SmoothingMode.AntiAlias;
        // new SolidBrush(Color.FromArgb(180,70,140,140))透明程度
        gp.DrawString(Title, new Font("华文彩云", fontsize),  new SolidBrush(Color.FromArgb(180,70,140,140)), new PointF(10, bit.Height - fontsize - 15));
        bit.Save(savePath, ImageFormat.Jpeg);
        Img.Dispose();
        bit.Dispose();
        return true;
    }
发生GDI+一般性错误，请问怎么办，请高人帮忙谢谢，分没55555555555