J# invalid paramater at runtime

[alcoheca]

Hi, I have this issue with a J# project I need to complete for uni.

public class Sprite
{
	private Image m_image;

	public Sprite(Image image)
	{
		m_image = image;
	}

	public int getWidth()
	{
		return m_image.get_Width();
	}

	public int getHeight()
	{
		return m_image.get_Height();
	}

	public void draw(Graphics g, int x, int y)
	{
		g.DrawImage(this.m_image, x, y);
	}
}

This compiles fine, however when I run the program the Image member variable m_image ends up with a Bitmap type rather than an Image.

Here's is the code where the bitmap is loaded, at no point do I cast, or use the bitmap type, so I'm left unsure how to fix it...

public Sprite getSprite(String ref)
	{
		/* check for cached sprite */

		if (imageCache.get(ref) != null)
		{
			return (Sprite)imageCache.get(ref);
		}

		/* not found, load in bitmap now */

		Image inputFile = null;

		try
		{
			inputFile = Image.FromFile(ref + ".bmp");
		}
		catch (Exception e)
		{
			System.err.println("Load failed: " + ref + ".bmp");
			System.exit(0);

		}

		// create a sprite, add it the cache then return it

		Sprite sprite = new Sprite(inputFile);
		imageCache.put(ref, sprite);

		return sprite;
	}

This cause an exception of "invalid paramater".

edit: I'm using the windows classes System.Drawing.* which is why I haven't posted this on the Java forum.

[alcoheca]

No one has any idea?

start of rant:
MSDN Forums are dead, no one is using J#, my lecturer is useless.. why force us to use this language with such limited support docs, examples, etc...