SQL error with Ajax-Chat

Hi,

We installed Ajax-Chat, chmod’d the config directory but when we try and use it we get these SQL error messages:

Warning: mysql_fetch_assoc() expects parameter 1 to be resource, boolean given in /var/www/our-website-root-dir/wp-content/plugins/buddypress-ajax-chat/bp-chat/chat/lib/class/CustomAJAXChat.php on line 216
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /var/www/our-website-root-dir/wp-content/plugins/buddypress-ajax-chat/bp-chat/chat/lib/class/CustomAJAXChat.php on line 240 You’re currently logged out. Notice: Only variable references should be returned by reference in /var/www/our-website-root-dir/wp-content/plugins/buddypress-ajax-chat/bp-chat/chat/lib/class/CustomAJAXChat.php on line 193

Any ideas ??
Thanks