EJB Adapter

I have installed EJB adapter 1.2 with Service pack 2 on Integration Server 6.0.1.
I have created an alias and the testing of connection succeeds.
I have deployed the java bean on WebSphere Application Server5. I have also copied the jar file to the IntegrationSystem/lib/jars folder.

When I click on server browser, select the alias and click on continue, I get the following error on screen. “Unable to get bean list: Failed to initialize the ORB”.

Also the following error is written in the server.log “[HTTP Handler] ERROR - UIHelper.getHomeBeansList - getHomeBeansList threw this: type(javax.naming.NamingException), msg(Failed to initialize the ORB)”

This is the error written in the error log.
"javax.naming.NamingException: Failed to initialize the ORB. Root exception is java.lang.reflect.InvocationTargetException: java.lang.VerifyError: (class: com/ibm/CORBA/iiop/ORB, method: createCDRInputStream signature: ()Lcom/ibm/CORBA/iiop/CDRInputStream;) Wrong return type in method.

Can you please let me know how can i solve this.

Thanks in advance.