Hi, when anyone tries to login to my X7 chat system we get the following errors:

Warning: mysql_fetch_row(): supplied argument is not a valid MySQL result resource in /www/zxq.net/a/n/w/anwoke8204/htdocs/phpbb/chat/lib/db/mysql.php on line 52

Warning: Cannot modify header information - headers already sent by (output started at /www/zxq.net/a/n/w/anwoke8204/htdocs/phpbb/chat/lib/db/mysql.php:52) in /www/zxq.net/a/n/w/anwoke8204/htdocs/phpbb/chat/lib/auth.php on line 119

Warning: Cannot modify header information - headers already sent by (output started at /www/zxq.net/a/n/w/anwoke8204/htdocs/phpbb/chat/lib/db/mysql.php:52) in /www/zxq.net/a/n/w/anwoke8204/htdocs/phpbb/chat/lib/auth.php on line 120

any idea as to how to fix this, many thanks.