Apache 2 Custom error doc problem

I have a number of custom documents for 404, 403, etc, but it turns out for some reason, apache can't find the 500 error document and it affects all my vhosts. I was setting up some error docs today, and when it came to testing the if the 500 error doc was working, it gave me the standard apache internal server error message followed by:

> Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

I had my syntax checked by people in freenode/#apache on irc, they said its fine, and they can't see what the problem is. All the error docs have the same permissions and are owned by the same user.

This is what my typical vhost entry looks like:

 <virtualhost 69.93.127.152:80="">ServerName domain.com
    ServerAlias www.domain.com
    DocumentRoot /wwwroot/htdocs/domain
    ErrorLog "logs/domain-error_log"
    LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" com$
    CustomLog logs/domain-access_log "combined"

   ErrorDocument 404 /404.html
   ErrorDocument 403 /403.html
   ErrorDocument 401 /401.html
   ErrorDocument 500 /500.html</virtualhost> 

I can't work out why the 500 doc doesn't work while all the others do, I can access it fine if I go directly to the doc via my web browser. :?

I'm using Centos 5 with Apache/2.2.8.