Emgu Image.Clone memory exception

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Emgu-CV

Hi, I am working face detection with Emgu, it works fine, but when I try to crop the Image to save it the program breaks and threw an "OutOfMemoryException". I am using the next method (recomended here) to crop the image:

private static Image cutImage(Image img, Rectangle cropArea)
            {
                Bitmap bmpImage = new Bitmap(img);
                Bitmap bmpCrop = bmpImage.Clone(cropArea, bmpImage.PixelFormat);
                return (Image)(bmpCrop);
            }

But in line "bmpImage.Clone()" program stops. What am I doing wrong?

Thanks in advance.
Dumar