알려주신 방법대로 error log monitor 플러그인 설치해서 확인된 오류사항은 아래와 같이 나왔습니다.

The log file /bconkorea/www/wp-content/debug.log does not exist or is inaccessible.

To enable error logging, create an empty file named "php-errors.log". Place it in a directory that is not publicly accessible (preferably outside your web root) and ensure it is writable by the web server. Then add the following code to wp-config.php:

@ini_set('log_errors', 'On');
@ini_set('error_log', '/full/path/to/php-errors.log');

For reference, the full path of the WordPress directory is:
/bconkorea/www/

See also: Editing wp-config.php, 3 Ways To Monitor PHP Errors