Can't start Clamav Antivirus

[Matchek]

Hi, i've added squid and squidguard. I wanted run antyvirus but can't start it. I've checked /var/log/ and there i no /clamav/ dir. I cant create it.

[2.2-RELEASE][maciejdan@pfSense.localdomain]/home/maciejdan(1): cd /var/log/
[2.2-RELEASE][maciejdan@pfSense.localdomain]/var/log(2): ls
apinger.log        gateways.log       lastlog            ntpd.log           ppp.log            routing.log        utx.log
dhcpd.log          installer.log      lighttpd.error.log openvpn.log        pptps.log          system.log         vpn.log
dmesg.boot         ipsec.log          lighttpd.log       poes.log           relayd.log         userlog            wireless.log
filter.log         l2tps.log          ntp                portalauth.log     resolver.log       utx.lastlogin
[2.2-RELEASE][maciejdan@pfSense.localdomain]/var/log(3): mkdir clamav
mkdir: clamav: Permission denied

albo sguidguard is not working, it's on but can't block anything …