protected function showError($title, $messages = '', $output)
    {
        $output->writeln("<error>$title</error>");
        $output->writeln('');
        if (is_array($messages)) {
            foreach ($messages as $message) {
                $output->writeln("<comment>$message</comment>");
            }
            $output->writeln('');
        } elseif ($messages != '') {
            $output->writeln("<comment>$messages</comment>");
            $output->writeln('');
        }
    }