[Plugin: WordPress Facebook Grabber] multiple errors given

Warning: session_start(): Cannot send session cookie – headers already sent by (output started at /vservers/wholesalepoint/htdocs/wp-includes/nav-menu-template.php:235) in /vservers/wholesalepoint/htdocs/wp-content/plugins/wordpress-facebook-grabber/wp-fb-grabber.php on line 182 Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /vservers/wholesalepoint/htdocs/wp-includes/nav-menu-template.php:235) in /vservers/wholesalepoint/htdocs/wp-content/plugins/wordpress-facebook-grabber/wp-fb-grabber.php on line 182 Notice: Undefined index: access_token in /vservers/wholesalepoint/htdocs/wp-content/plugins/wordpress-facebook-grabber/wp-fb-grabber.php on line 183 Notice: Undefined index: code in /vservers/wholesalepoint/htdocs/wp-content/plugins/wordpress-facebook-grabber/wp-fb-grabber.php on line 187

http://wordpress.org/extend/plugins/wordpress-facebook-grabber/