enable debug mode in coppermine config to get details on the query that failed. If all queries on all pages fail, this probably means your webhost hasn't properly brought back the mySQL database from the backup. You'll need a database tool like phpMyAdmin to verify.
You have another warning on your index page that says
Warning: Cannot modify header information - headers already sent by (output started
at /opt/root/home/xozgacom/public_html/coppermine/index.php:433)
in /opt/root/home/xozgacom/public_html/coppermine/themes/default/theme.php on line 654
, which usually means you have fiddled incorrectly with the theme. You're also seeming to have a very outdated version of coppermine running, post your exact version info as well.
GauGau
P.S. Next time, please post on the proper support board, as your question doesn't belong into "general discussion" at all. I can't move your question to the proper board though, since I don't know about the version you're using, but it must by older than cpg1.2.1