WSO2IS adding user by API

Question

I try to use wso2is API (RemoteUserStoreManagerService?wsdl) to create a new user. I can delete a user ,logon but I can't add a user .There is an Exception adding new user : org.apache.axis2.AxisFault: Exception occurred while trying to invoke service method addUser I set valid password met password policy. Heare is my code :

 AuthenticationAdminStub authstub = new AuthenticationAdminStub();
            String cookie = null;
            String auid = ConfigUtil.getProperty(ConfigUtil.MOM_ADMINID_INFO);
            String apassword = ConfigUtil.getProperty(ConfigUtil.MOM_ADMINPASS_INFO);
            Login login = new Login();
            login.setUsername(auid);
            login.setPassword(apassword);
            login.setRemoteAddress(APP_ID);
            LoginResponse res = authstub.login(login);
            //realm.
            if (res.get_return())
                cookie = (String) authstub._getServiceClient().getServiceContext().getProperty(
                        HTTPConstants.COOKIE_STRING);

            RemoteUserStoreManagerServiceStub realm = new RemoteUserStoreManagerServiceStub();
            ServiceClient serviceClient = realm._getServiceClient();
            Options option = serviceClient.getOptions();
            option.setManageSession(true);
            option.setProperty(HTTPConstants.COOKIE_STRING, cookie);
            IsExistingUser user = new IsExistingUser();
            user.setUserName(username);
            IsExistingUserResponse resEx = realm.isExistingUser(user);
            if (resEx.get_return()) {
                DeleteUser duser = new DeleteUser();
                duser.setUserName(username);
                realm.deleteUser(duser);
            }
            RemoteUserStoreManagerServiceStub.AddUser aUser = new RemoteUserStoreManagerServiceStub.AddUser();
            aUser.setUserName(username);
            RemoteUserStoreManagerServiceStub.ClaimValue[] claim = new RemoteUserStoreManagerServiceStub.ClaimValue[1];
            claim[0] = new RemoteUserStoreManagerServiceStub.ClaimValue();
            claim[0].setClaimURI("http://wso2.org/claims/businessphone");
            claim[0].setValue("0112842302");
            aUser.setClaims(claim);
            aUser.setCredential(password);
            aUser.setRoleList(new String[]{APP_ID, null});
            realm.addUser(aUser);

I generated stubs java code by axis2 ant generation code and add axis codes to my project. can any one help me. thanks.