problem in guest book

hello !

i have problem when i sign in admin guest book

Query Error
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MySQL Error : Query Error
Error Number: 1142 update command denied to user: 'q8mob_shot@localhost' for table 'book_auth'
Date : Thu, February 10, 2005 14:07:27
IP : 62.215.40.25
Browser : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Referer : http://www.q8mob.net/shot/guestbook/admin.php
PHP Version : 4.3.10
OS : Linux
Server : Apache
Server Name : www.q8mob.net

Check to make certain that your admin/config.inc.php database settings are correctly formed.

Did you run a search on here for mysql and Query Error? There's a lot of information already available that should help.

Their config file must be set up correctly as the guestbook is working. Update must also be working as they have a post in the guestbook. Does this error always occur?