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並前往https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Form%21FormState.php/function/FormState%3A%3AsetError/8.2.x

public function FormState::setError - Drupal API

setErrorByName is more convenient than setError, as it takes form element name. $form_state->setErrorByName('name_of_field', t('Error Message')) ...

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