DB Error – Creating Pages –

I need your help.

I created a page and when trying to view it is generated the following error:

Warning: mysql_connect(): Access denied for user: ‘ajordana_agbook1@localhost’ (Using password: YES) in /home/ajordana/public_html/contacto/lib/mysql.class.php on line 23

It’s strange because in wp-config.php not this established that user. and the error is not generated when creating post but a page.

What can be happening?