error to actived

I get this error

Warning: require_once(__DIR__/lib/mm/bootstrap.php) [function.require-once]: failed to open stream: No such file or directory in /home/tudinero/public_html/wp-content/plugins/mm/mm.php on line 19

Fatal error: require_once() [function.require]: Failed opening required ‘__DIR__/lib/mm/bootstrap.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/tudinero/public_html/wp-content/plugins/mm/mm.php on line 19

http://ww.wp.xz.cn/extend/plugins/mm/