Problem creating executing entity class program

i am getting the following error if i try the tutorial which creates an entity class, servlet
http://www.netbeans.org/kb/60/javaee/ejb30.html
i have followed each and every step given in the same sequence also. kindly help me out.
HTTP Status 500 -
type Exception report
message
descriptionThe server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: PWC1391: Servlet.init() for servlet ListNews threw exception
root cause
java.lang.RuntimeException: WEB5002: Exception in handleBeforeEvent.
root cause
com.sun.enterprise.InjectionException: Exception attempting to inject Resolved Ejb-Ref web.ListNews/newsEntityFacade@jndi: - > NewsEntityFacade into class web.ListNews
root cause
javax.naming.NameNotFoundException: No object bound to name java:comp/env/web.ListNews/newsEntityFacade
note The full stack traces of the exception and its root causes are available in the Sun Java System Application Server 9.1_02 logs.
Sun Java System Application Server 9.1_02

If you're wondering why you've had no response, it's because your question has precisely nothing to do with the topic of this forum.
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