Newbee problem running java program

I am very new at java and I've written a program that works in the Visual
Age environment.  However when I export my .class and .java files to a
folder on the IFS and attempt to run the program on the AS400, I get the
following:

java.lang.NoClassDefFoundError: TestListing
      java/lang/Throwable.<init>(Ljava/lang/String;)V+4 (Throwable.java:81)
Java program completed with exit code 1

1.  Where can I find out what this means?
2.  Does it have something to do with classpath?  I am very weak in this
area.
3.  How can I fix this problem?

The folder on the IFS is /myjava/bud.   Bud is the package name and it's
referenced in the classes.
The classes are TestListing and PrintTheReport.  TestListing just creates
an instance of PrintTheReport to run it.

What the program does is to read a file on the AS400 and print a listing of
it on System.out.   Nothing fancy.

Any help will be greatly appreciated!

Thanks!




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