Text Size Issue?

Hi Guys,

I am working on a multi Window GL Environment currently and I have some issue with the TextPrinter function.
The situations is, I have a function to draw different size of Text to the Screen, as :

public enum FontSize
{
Small = 0,
Mediam = 1,
Large = 2,
Larger = 3,
Huge = 4
}

// Used to cache the strings we want to print.
private static TextureFont[] fonts = new TextureFont[]
{
new TextureFont(new Font(FontFamily.GenericSerif, 8.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 16.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 24.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 48.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 128.0f)),

};

private static TextHandle textHandle;
private static TextPrinter textPrinter;

///
/// Print Text to the Screen using Absolute Positon Value
/// NOTE: The Font Context only be created once, so IF close the intial window
/// the FONT will be missing. THIS is an *issue* in OPENTK 0.91z
///
/// String to Screen
/// X
/// Y
public static void PrintTextAtAbsolutePosition(string outputString, float x, float y, FontSize fontSize)
{
textPrinter = new TextPrinter();
textPrinter.Prepare(outputString, fonts[(int)fontSize], out textHandle);
textPrinter.Begin();
GL.Translate(x, y, -1.0);
textPrinter.Draw(textHandle);
textPrinter.End();
}

It runs good under normal circumstance, however, it will pop

"There is not enough space to add this item. Consider calling the Clear() method."

Could anyone help me on this?

Thanks,
Julius