Error while creating process

[tejjbpm]

Hi all

I have been trying the hello world example in http://www.jorambarrez.be/blog/2009/07/01/jbpm4-hello-world

I have configured and when I run the main class which just prints a hello world message..I get this exception..Can anybody guide me what could be wrong..? thanks in advance..

org.jbpm.api.JbpmException: couldn't instantiate configuration of type org.jbpm.pvm.internal.cfg.ProcessEngineImpl
 org.jbpm.api.Configuration.instantiate(Configuration.java:92)
 org.jbpm.api.Configuration.<init>(Configuration.java:62)
 org.jbpm.api.Configuration.<init>(Configuration.java:51)
 be.jorambarrez.jbpm4.helloworld.Main.doGet(Main.java:31)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


root cause

java.lang.ClassCastException: org.jbpm.pvm.internal.cfg.ProcessEngineImpl cannot be cast to org.jbpm.api.Configuration
 org.jbpm.api.Configuration.instantiate(Configuration.java:90)
 org.jbpm.api.Configuration.<init>(Configuration.java:62)
 org.jbpm.api.Configuration.<init>(Configuration.java:51)
 be.jorambarrez.jbpm4.helloworld.Main.doGet(Main.java:31)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)