TWL error - Update

Newbie & Debugging Questions
#1

UPDATE: i got further from my original question. Now i am getting this error:


Exception in thread "main" java.lang.IllegalArgumentException: url is null
	at de.matthiasmann.twl.theme.ThemeManager.createThemeManager(ThemeManager.java:150)
	at TWL.Demo.init(Demo.java:40)
	at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:433)
	at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:357)
	at TWL.Demo.main(Demo.java:83)

the line that fails:

theme = ThemeManager.createThemeManager(Demo.class.getResource("TWL/simple.xml"), lwjglRenderer);

hi. i am trying to use the twl gui library following their guide, but i get this error and dont know how to fix it

#2

Try [icode]Demo.class.getResource("/TWL/simple.xml");[/icode] (notice the leading slash) and make sure there’s a simple.xml in the TWL folder in your classpath.