Delegates to `ArgumentParser.error`

def error(self, message=None):
        """
        Delegates to `ArgumentParser.error`
        """
        if self.__parser__:  # pylint: disable-msg=E1101
            self.__parser__.error(message)  # pylint: disable-msg=E1101
        else:
            self.logger.error(message)
            sys.exit(2)