Why can't squid create any file?

I was installing squid-latest version(2.3.....)
I've successfully installed squid.
And I modified squid.conf
But when I was trying to create a swap directory, failed because of following error
I added
cache_dir ufs /var/spool/squid 500 16 256
and I created user, squid by
useradd -u 23 -d /var/spool/squid -r -s /dev/null
and I tried
/usr/local/squid/bin/squid -z
but failed. WhyWhyWhyWhy
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Received on Wed Feb 09 2000 - 01:03:48 MST