I am trying to use the Napkin lookandfeel from
http://napkinlaf.sourceforge.net/ but cant seem to get it working.
In my "main" method I call:
UIManager.setLookAndFeel(new NapkinLookAndFeel());
The NapkingLookAndFeel class is the right one. I've also imported the right package.
However, when running the code I get an "UnsupportedClassVersionError". What does this mean?