validator.LongRangeValidator doesn't work

I just added this validator to a Textfield:

TextField tf = new TextField("CUIL"); tf.setRequired(true); tf.addValidator(new LongRangeValidator("CUIL no válida 0 a " + Long.MAX_VALUE, 0L, Long.MAX_VALUE)); but is not allowing any positive number, no matter the value, always shows up the “!”
Im using Vaadin 7.5.7 and upgraded to 7.6.2, but nothing changed