Please help, errors

[proenski]

YaBB SE Version: 1.5.5
PHP Version: 4.3.4
MySQL Version: 4.0.x
Server Platform: Unix, Linux, or BSD
Link to Forum: http://www.depechemodeforum.com/yabbse/index.php

Problem Description:
Oh, dear I keep getting these errors:

Code Select Expand

Can't create/write to file '/tmp/#sql_3e23_0.MYI' (Errcode: 23)
File: /home/.jasper/proenski/depechemodeforum.com/yabbse/Sources/MessageIndex.php
Line: 267


and

Code Select Expand

Can't create/write to file '/tmp/#sql_3e23_0.MYI' (Errcode: 23)
File: /home/.jasper/proenski/depechemodeforum.com/yabbse/Sources/BoardIndex.php
Line: 151

What can I do

[[Unknown]]

This is a MySQL error.  Please tell your host:

$ perror 23
Error code  23:  Too many open files in system

-[Unknown]