TimerTask calling method twice

I have a TimerTask that calls a method every 1 minute, but the method is called twice. This method checks for some factors and sends an e-mail, as the method is called twice, and the e-mail is sent twice. Does anyone know where the problem might be?

private void tarefa() {
        new Timer().schedule(
                new TimerTask() {
                    @Override
                    public void run() {
                        alertaGeral();
                        System.out.println("Alertando..");
                    }

                }, 0, 1000 * 60 * 1);
    }

Method that is called in TimerTask :

private void alertaGeral() {
        try {
            DateFormat df = new SimpleDateFormat("HH:mm");
            String hora = df.format(new Date());

            SimpleDateFormat formatador = new SimpleDateFormat("HH:mm");
            Date hour = formatador.parse(hora);
            Time time = new Time(hour.getTime());

            Calendar alertDate = Calendar.getInstance();
            alertDate.setTime(time);
            alertDate.add(Calendar.MINUTE, 0);

            Date d = new Date();
            SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
            String data = dateFormat.format(d);
            SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
            Date dataf = formatter.parse(data);

            List<Compromisso> lista = atualizarDataInicial(s);

            for (Compromisso c : lista) {
                Time time1 = new Time(c.getHoraInicial().getTime());
                java.util.Date utilDate = new java.util.Date(c.getDataInicio().getTime());
                Calendar alertHour = Calendar.getInstance();
                alertHour.setTime(time1);
                alertHour.add(Calendar.MINUTE, -5);

                if (alertHour.compareTo(alertDate) == 0 && utilDate.compareTo(dataf) == 0) {
                    EnviaEmail e = new EnviaEmail();
                    e.enviaEmail(c.getNomeBeneficiario(), c.getDataInicio(), c.getHoraInicial(), c.getCompromisso());
                }
                System.out.println("HORA INICIAL CORRETA: " + c.getHoraInicial());
                System.out.println("HORA INICIAL ADIANTADA: " + alertHour.getTime());
                System.out.println("HORA SISTEMA " + alertDate.getTime());

            }
        } catch (ParseException ex) {
            ex.printStackTrace();
        }
    }