Problemas con Jdeveloper

[ChiramMFM]

java.lang.NoClassDefFoundError: WS/notmypackage/SIEBusiness
at WS.mypackage.SIEWebService.ExisteixCarnetista(SIEW ebService.java:89)
at WS.mypackage.__SIEWebServiceStatelessWrapper.invok eMethod(__SIEWebServiceStatelessWrapper.java:198)
at oracle.j2ee.ws.InvocationWrapper.invoke(Invocation Wrapper.java:381)
at oracle.j2ee.ws.RpcWebService.doGetRequest(RpcWebSe rvice.java:650)
at oracle.j2ee.ws.BaseWebService.doGet(BaseWebService .java:1173)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:853)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.2.0)].server.http.ServletRequestDispatcher.invoke(Servl etRequestDispatcher.java:802)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.2.0)].server.http.ServletRequestDispatcher.forwardInter nal(ServletRequestDispatcher.java:340)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.2.0)].server.http.HttpRequestHandler.processRequest(Htt pRequestHandler.java:830)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.2.0)].server.http.HttpRequestHandler.run(HttpRequestHan dler.java:285)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.2.0)].server.http.HttpRequestHandler.run(HttpRequestHan dler.java:126)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.2.0)].util.ReleasableResourcePooledExecutor$MyWorker.ru n(ReleasableResourcePooledExecutor.java:186)
at java.lang.Thread.run(Thread.java:534)

Esto es el stack(no se si es la palabra) del nuevo error, pensaba que era el mismo, pero este es NoDefFoundError.