Fatal error

Installing the Communities plugin i have the following error:

Fatal error: Cannot redeclare communities_make_current() (previously declared in /home/mitribu/public_html/wp-content/mu-plugins/communities-framework.php:113) in /home/mitribu/public_html/wp-content/plugins/15850_communities-1.1.3/communities-framework.php on line 138

any clue?