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The script I gave you doesn't change anything to the way the game calls its windowskin so it shouldn't be giving that error. In fact the script simply calls the game's window methods to draw itself in the same style your menu window should be to prevent discrepancy with the rest of your game.

In human language: The script I gave you, bases itself upon the standard script for its windows so it wouldn't appear different from the rest of your window. That's why it shouldn't be giving that error, unless you have overridden the standard script. (not adjusted it, but overridden)

Are you using any other custom menus and if so, which ones?