issue with plugin i just purchased

hi, i just purchased this plugin & installed it on my site, http://www.reelafrican.com, and the plugin breaks the theme. i get these errors--please advise on how to fix:

Warning: session_start() [function.session-start]: open(/var/chroot/home/content/31/6576931/tmp/sess_r2q5tmap073gu4pf0g37hpeoe0, O_RDWR) failed: No such file or directory (2) in /home/content/31/6576931/html/newsite/wp-content/plugins/wpmu-dev-facebook/lib/external/facebook.php on line 49

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/31/6576931/html/newsite/wp-content/plugins/wpmu-dev-facebook/lib/external/facebook.php:49) in /home/content/31/6576931/html/newsite/wp-content/plugins/wpmu-dev-facebook/lib/external/facebook.php on line 49

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/31/6576931/html/newsite/wp-content/plugins/wpmu-dev-facebook/lib/external/facebook.php:49) in /home/content/31/6576931/html/newsite/wp-content/plugins/wpmu-dev-facebook/lib/external/facebook.php on line 49