error squid when using pf

[sonjaya]

hi all 

i try use pf for transparant proxy ( i get from here
http://www.benzedrine.cx/transquid.html )
when i configure manual to use proxy is working fine .
then i try to use pf for redirection connection to
proxy :
int_if="vr0"
ext_if="xl0"

rdr on $int_if inet proto tcp from any to any port www
-> 127.0.0.1 port 3128

pass in on $int_if inet proto tcp from any to
127.0.0.1 port 3128 keep state
pass out on $ext_if inet proto tcp from any to any
port www keep stat

i always get error = Unable to determine IP address
from host name for www.domain.com such like error dns
but my dns resolver working fine .
what should i chek squid or my pf script 

thx 



My Regard's

SONJAYA