Stubby 127.0.0.1 not able to connect.

[QKCJQ]

Hi
I have stubby install and running on Ubuntu 22.04.03 LTS on my system. These 2 days I have been having "unable to connect to internet" when I switch on DNS 127.0.0.1, and when I turn off DNS 127.0.0.1, my internet connection will be normal. When I run systemctl status stubby on terminal, I got the error as below

jq@OEM:~$ systemctl status stubby
× stubby.service - DNS Privacy Stub Resolver
Loaded: loaded (/lib/systemd/system/stubby.service; enabled; vendor preset>
Active: failed (Result: exit-code) since Tue 2023-11-21 09:37:55 +08; 18mi>
Docs: https://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Daemon+-+Stubby
Process: 1637 ExecStart=/usr/bin/stubby -C /etc/stubby/stubby.yml (code=exi>
Main PID: 1637 (code=exited, status=46)
CPU: 30ms

Nov 21 09:37:53 OEM systemd[1]: stubby.service: Main process exited, code=exite>
Nov 21 09:37:53 OEM systemd[1]: stubby.service: Failed with result 'exit-code'.
Nov 21 09:37:55 OEM systemd[1]: stubby.service: Scheduled restart job, restart >
Nov 21 09:37:55 OEM systemd[1]: Stopped DNS Privacy Stub Resolver.
Nov 21 09:37:55 OEM systemd[1]: stubby.service: Start request repeated too quic>
Nov 21 09:37:55 OEM systemd[1]: stubby.service: Failed with result 'exit-code'.
Nov 21 09:37:55 OEM systemd[1]: Failed to start DNS Privacy Stub Resolver.
lines 1-15/15 (END)

As attach are the config and error codes.

I appreciate all the help
Thank you