Error in running java

I cant run the programme because of this error . Can anyone tell whats the poblems . The screen shows : Exception in thread "main" java.langNoClassDeFoundError
[173 byte] By [megallona] at [2007-11-26 15:57:52]
# 1
Well, I wonder what would happen if you were to type "NoClassDefFoundError" in a search engine, if only one existed.
warnerjaa at 2007-7-8 22:18:50 > top of Java-index,Java Essentials,Java Programming...
# 2

Hey, I found this neat new thing on that interweb thing it's called Google (that's an odd name). Anyway I typed in Java + NoClassDeffoundError and this is what it gave me back.

http://www.google.com/search?hl=en&q=Java+%2B+NoClassDefFound

megallon I'm not intentionally heaping scorn on you, you just caught me in one of those moods. Seriously, you'll find what you need if you start reading the results of the above search.

PS.

puckstopper31a at 2007-7-8 22:18:50 > top of Java-index,Java Essentials,Java Programming...