Advanced Guestbook 2.3.1 Query Error

Hi, I was wondering if someone could help me. I've had the guestbook installed and functioning perfectly for about three months, but now I get this query error when trying to access the index.php file:

MySQL Error : Query Error
Error Number: 1 Can't create/write to file '/var/tmp/#sql56da_4_0.MYI' (Errcode: 2)
PHP Version : 4.1.2
OS : FreeBSD
Server : Apache/1.3.26 (Unix) FrontPage/5.0.2.2510

I was wondering if anyone knows whether this is a problem with my guestbook, or whether it's a problem with the database?

Thanks to anyone who can help.

give mysql write access to the folder '/var/tmp/

Thanks a lot.

I'll have to speak to my host about that, they sort out things like that automatically usually.