Eclipse thinking classes are jar files?

I've did all the tutorials in the wiki, and they have all ran perfectly. But now every thing I try to run it says:



java.lang.NoClassDefFoundError: Test
Exception in thread "main"



It's thinking the classes are jar files...

It has to be because the main class is defined.

did you ever get this figured out?



And if not, could you post the whole stack trace?