TWL error - Update

[Ayne]

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

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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:

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

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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

[sproingie]

Try

Demo.class.getResource("/TWL/simple.xml");

(notice the leading slash) and make sure there's a simple.xml in the TWL folder in your classpath.