Warning: require_once(lib/wordfenceClass.php) [function.require-once]: failed to open stream: No such file or directory in /wp-content/plugins/wordfence/wordfence.php on line 24

Fatal error: require_once() [function.require]: Failed opening required 'lib/wordfenceClass.php' (include_path='.:/:/usr/local/php/pear5') in /wp-content/plugins/wordfence/wordfence.php on line 24