Java with Javafx

Question

People I’m trying to make a thread call when opening the customer registration screen, but my screen is not opening, someone can help??

    @FXML
    void OpenCliente(ActionEvent event) {
        try {
            //CREATING A THREAD
            Task<Void> ts = new Task<Void>() {
                @Override
                protected Void call() throws Exception{
                    ClienteExec cliente = new ClienteExec();
                    cliente.start(new Stage());
                    return  null;
                }
                @Override
                protected void succeeded(){
                    super.succeeded();
                }
            };
            new Thread(ts).start();
            }catch (Exception e) {
                e.printStackTrace();
        }
    }