Field::getValueNotUniqueError

public function getValueNotUniqueError(): Error
{
	$title = $this->getTitle() ?? $this->getName();
	$message = $this->getSettings()['fieldValueNotUniqueErrorMessage'] ?? null;
	if (!$message)
	{
		$message = Loc::getMessage(static::MESSAGE_FIELD_VALUE_NOT_UNIQUE, [
			'#FIELD#' => $title,
		]);
	}

	return new Error(
		$message,
		static::ERROR_CODE_VALUE_NOT_UNIQUE,
		[
			'fieldName' => $this->getName(),
		]
	);
}