Filing of a lawsuit seeking urgent provisional relief to stay the effects of an arbitration award. Confusion caused by the arbitration center, which erroneously notified one of the parties as to the date of the conciliation hearing. Condemnation of the absent party. Violation of the rights to adversarial proceedings and full defense (Article 5, LV, of the Brazilian Federal Constitution). "Fumus boni iuris" and "periculum in mora" having been established. Grant of urgent provisional relief: