NextDNS on Raspberry Pi - LOG error

Hi,
Having had the NextDNS client installed on an Edgerouter ER4 I decided to try to run the client on an Raspberry Pi (B+).
Installation/Configuring was smooth.
When running the command nextdns log the result is:
pi@dns:~ $ sudo nextdns log
Error: exit status 1

Running the command systemctl status nextdns shows the service running
● nextdns.service - NextDNS DNS53 to DoH proxy.
   Loaded: loaded (/etc/systemd/system/nextdns.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2020-12-27 10:49:15 GMT; 1 day 1h ago
 Main PID: 1108 (nextdns)
    Tasks: 8 (limit: 881)
   CGroup: /system.slice/nextdns.service
           └─1108 /usr/bin/nextdns run

My configuring:
config xxxxxx
report-client-info true
timeout 5s
auto-activate true
cache-size 10MB
detect-captive-portals false
hardened-privacy false
listen:53
cache-max-age 0s
use-hosts true
setup-router true
control /var/run/nextdns.sock
log-queries false
max-ttl 5s
discovery-dns
bogus-priv true

Also, the CLI command nextdns cache-stats is empty.

Anyone had the same issues?