I want to send  an entity object  and of course this object implements Serializable interface. finally i encountered to another exception. what is your idea about this exception

Registering ad hoc servlet: WebPathPath: context root = "/ebank-app-client", path = "'
Java web  Start services started for stand-alone app client  com.sun.enterprise.appclient.jws.AppclientContentOrigin@18db76b registration name=ebank-app-client, context root=/ebank-app-client, module name=
"IOP00810257: (MARSHAL) Could not load class ebankclient.persistobj.bank.Customer"
org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 257 completed: Maybe
at com.sun.corba.ee.impl.logging.ORBUtilSystemException.couldNotFindClass(ORBUtilSystemException.java:9684)
at com.sun.corba.ee.impl.logging.ORBUtilSystemException.couldNotFindClass(ORBUtilSystemException.java:9699)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1042)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:896)
at com.sun.corba.ee.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:466)
at com.sun.corba.ee.impl.corba.TCUtility.unmarshalIn(TCUtility.java:296)
at com.sun.corba.ee.impl.corba.AnyImpl.read_value(AnyImpl.java:610)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:748)
at com.sun.corba.ee.impl.encoding.CDRInputStream.read_any(CDRInputStream.java:406)
at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.readAny(Util.java:504)
at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl$10.read(DynamicMethodMarshallerImpl.java:286)
at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl.readArguments(DynamicMethodMarshallerImpl.java:435)
at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:152)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:687)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:227)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1846)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1706)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:1088)
at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:223)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:806)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.dispatch(CorbaMessageMediatorImpl.java:563)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.doWork(CorbaMessageMediatorImpl.java:2567)
at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:555)