Sync Facebook Events doesnt work

http://johnnysinnis.com

doesnt work, do i need to fill in more?

Facebook App ID:this one i have
Facebook App Secret: ???
Update Fequency:
Add Facebook Page UID: ???

Warning: Invalid argument supplied for foreach() in /home/sinnis/domains/johnnysinnis.com/public_html/wp-content/plugins/sync-facebook-events/sync-facebook-events.php on line 223

http://wordpress.org/extend/plugins/sync-facebook-events/