[Plugin: Facebook Comments for WordPress] Fatal error! NEED HELP

Hey, I neeed some help. I have just installed this plugin, when I return to check out my homepage it says:

Fatal error: Cannot use object of type TopPage as array in domains/mywebsite.com/html/wp-content/plugins/facebook-comments-for-wordpress/facebook-comments.php on line 136

HELP?

http://wordpress.org/extend/plugins/facebook-comments-for-wordpress/