java.lang.ClassCastException: This exception has no message.

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java.lang.ClassCastException:
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
at undefined.NewGenericPortlet.lookupNewSessionBean(NewGenericPortlet.java:185)
at undefined.NewGenericPortlet.doView(NewGenericPortlet.java:93)
at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:235)
at javax.portlet.GenericPortlet.render(GenericPortlet.java:163)
at com.sun.portal.portletappengine.PortletAppEngineServlet.service(PortletAppEngineServlet.java:261)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at java.security.AccessController.doPrivileged(Native Method)

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