CLASSCASTEXCEPTION

Hi All,
   I am trying to access webServices through a control
and I get the follwoing error

Failure=com.bea.control.ServiceControlException: <xml-fragment xmlns:
SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:
SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/">  
<faultcode>    SOAP-ENV:Client  </faultcode>  
<faultstring>    EJB Exception: ; nested exception is:
        java.lang.ClassCastException 
</faultstring>  
<detail>
java.rmi.RemoteException: EJB Exception: ; nested exception is:       
java.lang.ClassCastException
   at
weblogic.ejb20.internal.EJBRuntimeUtils.throwRemoteException(EJBRuntimeUtils.jav
a:102)
   at
weblogic.ejb20.internal.BaseEJBHome.handleSystemException(BaseEJBHome.java:307)
   at weblogic.ejb20.internal.BaseEJBObject.postInvoke(BaseEJBObject.java:263)
   at
weblogic.ejb20.internal.StatelessEJBObject.postInvoke(StatelessEJBObject.java:14
0)
   at
com.bea.wlw.runtime.core.bean.SyncDispatcher_k1mrl8_EOImpl.invoke(SyncDispatcher
_k1mrl8_EOImpl.java:110)
   at
com.bea.wlw.runtime.core.dispatcher.Dispatcher.remoteDispatch(Dispatcher.java:16
1)
   at
com.bea.wlw.runtime.core.dispatcher.Dispatcher.dispatch(Dispatcher.java:49)
   at
com.bea.wlw.runtime.core.dispatcher.HttpServerHelper.executePostRequest(HttpServ
erHelper.java:713)
   at com.bea.wlw.runtime.core.dispatcher.HttpServer.doPost(HttpServer.java:49)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
   at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStu
bImpl.java:1006)
   at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419
)
   at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315
)