Problem starting adblock

Hi there,

again a try to solve my adblock problem.

root@router:~# opkg install adblock
Installing adblock (1.3.3-1) to root...
Downloading https://repo.turris.cz/omnia/packages//packages/adblock_1.3.3-1_all.ipk.
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 11693  100 11693    0     0  15375      0 --:--:-- --:--:-- --:--:-- 17770
Configuring adblock.
adblock[29344] info : adblock installation finished successfully, 'opkg' currently locked by package installer
adblock[29352] info : adblock installation finished successfully, 'opkg' currently locked by package installer
root@router:~# /etc/init.d/adblock start
adblock[29440] info : domain adblock processing started (1.3.3, r47055, 05.04.2017 08:22:31)
adblock[29440] info : backup/restore will be disabled
adblock[29440] error: failed to initialize volatile IPv4 firewall chain 'adb-dns'
adblock[29440] error: domain adblock processing failed (1.3.3, r47055, 05.04.2017 08:22:32)
root@router:~#

Any ideas how to solve this? (the opkg lock file probleme is a minor one, this can be solved)

Cheers!