Service invocation threw an exception with message : null;

bonsoir tout le monde
j'ai un problème lorsque je test mon service voilà le code mon service

Code:

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@WebService(serviceName = "MyWebService")
public class MyWebService {
    @EJB
    private CandidatDaoRemote ejbRef;// Add business logic below. (Right-click in editor and choose
    // "Insert Code > Add Web Service Operation")
 
    @WebMethod(operationName = "ajouterNouvCandidat")
    public Candidat ajouterNouvCandidat(@WebParam(name = "id") int id, @WebParam(name = "nom") String nom, @WebParam(name = "prenom") String prenom, @WebParam(name = "age") int age, @WebParam(name = "sexe") String sexe, @WebParam(name = "StatutMarit") String StatutMarit, @WebParam(name = "nationalite") String nationalite, @WebParam(name = "adresse") String adresse, @WebParam(name = "codePost") String codePost, @WebParam(name = "pays") String pays, @WebParam(name = "ville") String ville, @WebParam(name = "email") String email, @WebParam(name = "mobile") String mobile, @WebParam(name = "fixe") String fixe) {
        return ejbRef.ajouterNouvCandidat(nom, prenom, age, sexe, StatutMarit, nationalite, adresse, codePost, pays, ville, email, mobile, fixe);
    }
 
}

et voiciiiiiii l'erreur
Service invocation threw an exception with message : null; Refer to the server log for more details
Exceptions details : java.lang.IllegalArgumentException

Aidez moi svp :cry: