Problem running the client

[Steve Jerome]

when I tried to run the client program i'm getting following exception.I'm running the CalculatorClient example in mikalai notes.any idea about the problem.my server is running.

Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
at $Proxy0.add(Unknown Source)
at by.iba.client.CalculatorClient.main(CalculatorClient.java:23)
Caused by: java.lang.Exception: Can not make remoting client invocation due to not being connected to server.
at org.jboss.remoting.Client.invoke(Client.java:1555)
at org.jboss.remoting.Client.invoke(Client.java:530)
at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:41)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88)
at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:46)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88)
at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:40)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88)
at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:72)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88)
at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:103)
... 2 more