Listen on all addresses belonging to an interface... error

version

Knot DNS Resolver, version 1.1.0

OS

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04 LTS
Release:        16.04
Codename:       xenial
$ uname -rm
3.14.73-odroidc2 aarch64

conf

net = { net.eth0 }

interactive mode

[system] interactive mode
> net.eth0
[addr] => {
    [1] => 192.168.122.223
    [2] => 240b:11:8500:3900:10::223
    [3] => fe80::21e:6ff:fe33:4c50
}
[mac] => 00:1e:06:33:4c:50

issue

$ sudo /usr/sbin/kresd -v -c /etc/knot-resolver/kresd.conf -f 1 /run/kresd
error: Invalid argument