NoClassDefFoundError exception

I think I need to reload NWDS on my laptop. I just attended the 2005 CRM Boot Camp and they had us load, unload, reload stuff on our laptops so many times that it doesn’t look anything like it did.

In order to use my NWDS, I had to pull down J2SE 1.4.2_08 from Sun.com. And now it seems to compile my java file but can’t seem to run or debug them. I keep getting:

java.lang.NoClassDefFoundError: KensApplication

Exception in thread "main"

The class files are getting created and the same source works on another system.

What’s the best way to reload NWDS and co. ??