error doc handler ok for 403 but fails on 404

["j k" <jonnykent@xxxxxxxxx>]

I followed this suggestion in the apache2 htpd.conf to use the default error handlers:
# The internationalized error documents require mod_alias, mod_include
# and mod_negotiation.  To activate them, uncomment the following 30 lines.

and it works fine for a 403 i get the expected response:

Access forbidden!

You don't have permission to access the requested directory. There is either no index document or the directory is read-protected.

Error 403

myserver
Sat Jun 9 13:48:46 2007
Apache

But when I access a non-existant file
http://myserver/nof.html

it brings back an odd message with an exra not found in it:

Not Found

The requested URL /nof.html was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

---

Apache Server at myserver Port 80

and when I look in the logs it seems to be looking in the wrong place for the error doc:
[Sat Jun 09 13:32:32 2007] [error] [client 
74.6.26.136] File does not exist: /var/www/localhost/htdocs/error.html

What might I have done wrong that has messed up what should be a plain vanila default setup? 

Thanks.