DNSBL is totally disabled, but I saw the following line in System log:

/usr/local/www/pfblockerng/pfblockerng.php: The command '/sbin/ifconfig 'igb1' delete '10.10.10.1'' returned exit code '1', the output was 'ifconfig: ioctl (SIOCDIFADDR): Can't assign requested address'

What was happened?