public function onPreviousStepInvalid(PreviousStepInvalidEvent $event)
 {
     $this->logEventCall('onPreviousStepInvalid #' . $event->getInvalidStepNumber());
 }
 public function onPreviousStepInvalid(PreviousStepInvalidEvent $event)
 {
     $event->getCurrentStepForm()->addError($this->getPreviousStepInvalidFormError($event->getInvalidStepNumber()));
 }