i got problem everytime i run my files

i always have the same problem when i run my classes event if it runs on another computer:

init:

deps-jar:

Compiling 1 source file to C:\Documents and Settings\Ha Thi Nga\exercite\build\classes

compile-single:

run-single:

java.lang.NoClassDefFoundError: exercite/HomeWork

Exception in thread "main"

Java Result: 1

i think i configured the jdk not right but i don;t know ow to fix

[441 byte] By [valhensinga] at [2007-11-26 17:35:37]