i am currently running fedora core 3 and it happens to have java 1.4.2 in it. can someone tell me what does this error mean? i have successfully compiled it free of errors but i can't run it :

Exception in thread "main" java.lang.NoClassDefFoundError: Average.java
at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)
at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)
at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0)
at __gcj_personality_v0 (/home/ezzmir/documents/java.home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre)
at __libc_start_main (/lib/tls/libc-2.3.3.so)
at _Jv_RegisterClasses (/home/ezzmir/documents/java.home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre)


thanks.