// Setup
        final String message = "Test SSO error message";
        final Exception cause = new RuntimeException("Test cause");
        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsSsoLoginError(UserMessages.GLOBAL_PROPERTY_KEY);

        // Execute
        final SsoMessageException exception = new SsoMessageException(messageCode, message, cause);

        // Verify
        assertNotNull(exception);

                if (logger.isDebugEnabled()) {
                    logger.debug("SSO is available but no user found.");
                }
                saveError(messages -> messages.addErrorsSsoLoginError(GLOBAL));
            }
            if (logger.isDebugEnabled()) {
                logger.debug("Redirecting to login page.");
            }
            return redirect(LoginAction.class);
        }

     * <pre>
     * message: SSO login process failed.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsSsoLoginError(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_sso_login_error));
        return this;
    }

    /**