If you have moved your root installation of WordPress to a subdirectory as described here (Method 1), you have to make a small adjustment. Because of the new location of WordPress’s .htaccess file, you have to tell Borlabs Cache where it can find it. Open your wp-config.php and add the following before /* That’s all, stop editing! Happy blogging. */:
define('BORLABS_CACHE_HTACCESS_PATH', realpath(__DIR__.'/../').'/');
/* That's all, stop editing! Happy blogging. */