Error while running my first ejb program

[ashok ganesan]

hi i m using Sun Application Server 8.1 and tried to run a ejb code that was given in head first ejb book. as per this online tutorial http://java.sun.com/j2ee/1.4/docs/tutorial-update6/doc/ created an application and deployed it ane even created the client side jar file . but when running it using the command appclient -client AdviceAppClient.jar
i m getting the following error

E:\projects\advice>appclient -client AdviceAppClient.jar
Feb 2, 2007 10:18:55 AM com.sun.enterprise.appclient.Main <init>
WARNING: ACC003: Application threw an exception.
java.lang.NoClassDefFoundError: headfirst.AdviceHome at AdviceClient.class$(AdviceClient.java:27)
at AdviceClient.go(AdviceClient.java:27)
at AdviceClient.main(AdviceClient.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.enterprise.util.Utility.invokeApplicationMain(Utility.java:23
7)
at com.sun.enterprise.appclient.Main.<init>(Main.java:430)
at com.sun.enterprise.appclient.Main.main(Main.java:99)


couldnot figure out the actual cause of the error ......
if someone could help me out of it

thanks in advance

ashok