Fatal error after installing chat plugin after ultimate facebook

Emergency!!

I installed both ultimate facebook plugin and chat plugin. For both i entered the app details to make facebook connect possible. I checked in the chat plugin that i have another facebook connect installed. Now i get the message: Fatal error: Cannot redeclare class Facebook in /www/wordpress/websiteswork394/drasorayaeu/wp-content/plugins/wordpress-chat/lib/facebook-php-sdk/facebook.php on line 93. And i cant even enter my wp-admin anymore. Appearently the checking of the "other facebook connect", doesnt stop the pluging to try to load the sdk. Where can i fix this reloading attempt in the chat and or other way to get the thing going again?