FormErrorHandler::handleFormErrors

public FormErrorHandler::handleFormErrors(array &$form, FormStateInterface $form_state)

public function handleFormErrors(array &$form, FormStateInterface $form_state) {
  // After validation check if there are errors.
  if ($errors = $form_state->getErrors()) {
    // Display error messages for each element.
    $this->displayErrorMessages($form, $form_state);

    // Loop through and assign each element its errors.
    $this->setElementErrorsFromFormState($form, $form_state);
  }

  return $this;
}