can not view guestbook get error

I can access admin panel and view guestbook. When I try to access guestbook with out going through the access panel I receive the following error message. Any help will be greatly appreciated.

MySQL Error : Query Error
Error Number: 1 Can't create/write to file '/var/tmp/#sql_b067_0.MYI' (Errcode: 2)
Date : Sat, May 13, 2006 05:22:17
IP : 68.48.237.221
Browser : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 3.1)
Referer :
PHP Version : 4.3.11
OS : FreeBSD
Server : Apache/1.3.33 (Unix) FrontPage/5.0.2.2510 mod_fastcgi/2.4.2
Server Name : marylandflyers.com

Speak to your hosts as there is a problem on the mysql server.