java - GWT: Could not locate RequestContext method -

i have

public interface myrequestfactory extends requestfactory {   @service(client.class)   public interface clientrequest extends requestcontext {       request<list<clientproxy>> getclients();       request<clientproxy> findclient(int id);       instancerequest<clientproxy, void> persist();       instancerequest<clientproxy, void> remove();               } } 

i calling method with

    myrequestfactory.clientrequest request = requests.clientrequest();     request<clientproxy> getreq = request.findclient(clientid);     getreq.fire(             new receiver<clientproxy>() {                 @override                 public void onsuccess(clientproxy response) {                     display.getbreadcrumptextbox().settext( response.getbreadcrump() );                     display.getintroductiontextarea().settext( response.getintroduction() );                 }                 @override                 public void onfailure(serverfailure error) {                     window.alert( error.getmessage() );                 }                                }     );       

i getting

server error: not locate requestcontext method de.x.y.z.myrequestfactory$clientrequest::findclient

what wrong?

i made class client serializable , added empty constructor:

public class client implements serializable {     private static final long serialversionuid = 5744986706947752922l;      public client() {     } ... 

now working.