Ultimate facebook fatal error

Hello,

I am trying to activate ultimate face book on buddypress/wp multisite but is receiving the following error message

Fatal error: Uncaught exception 'Exception' with message 'Facebook needs the CURL PHP extension.' in www\wp\wp-content\plugins\wpmu-dev-facebook\lib\external\base_facebook.php:19 Stack trace: #0 www\wp\wp-content\plugins\wpmu-dev-facebook\lib\external\facebook.php(18): require_once() #1 www\wp\wp-content\plugins\wpmu-dev-facebook\wpmu-dev-facebook.php(102): require_once(www\...') #2 www\wp\wp-admin\plugins.php(146): include('H:\moweswp\www\...') #3 www\wp\wp-admin\plugins.php(148): plugin_sandbox_scrape('wpmu-dev-facebo...') #4 {main} thrown in www\wp\wp-content\plugins\wpmu-dev-facebook\lib\external\base_facebook.php on line 19