How to run a HelloWorld EJB using appclient command

[Muhammad jokhio]

Hi friends; I am new to EJBs. I have installed the Sun Java App Server 8. I am deploying my Simple HelloWorld Bean, compiling it successfully. My deployment is also 100% successfull in deploytool of the server. I have written one client with the name as HelloClient; when I run it using the appclient -client HelloApplicationClient.jar then it is giving following error message

Mar 03, 2007 com.sun.enterprise.application.Main.<init>
no application client descriptor defined for: [null]

I have also used the -mainclass parameter of the appclient command but still same error:
Any body who has experience on EJBs or Sun JAva App Server, please solve my problem: I need very urgent help:

Looking forward for hopeful reply:

Muhammad Shaban Jokhio;
Lecturer, Dept CS & SW, Mehran University,
Jamshoro, Pakistan