[ERROR] Warning: Use of undefined constant G5_THEME_PATH - assumed 'G5_THEME_PATH' (this will throw an Error in a future version of PHP) in

if(is_file(G5_THEME_PATH.'/theme.config.php'))
	include_once(G5_THEME_PATH.'/theme.config.php');

위 코드를 아래 코드로 수정했더니 해결되었다.

if(defined('G5_THEME_PATH') && is_file(G5_THEME_PATH.'/theme.config.php'))
    include_once(G5_THEME_PATH.'/theme.config.php');