Why is varnishlog not working and how to fix it?

Question

ubuntu

given: ubuntu server 18.04, varnish 6.2.2, as a proxy on port 80, nginx on 8080.
Everything is fine on a couple of other servers, but something like varnishlog, varnishtop do not work.
Outputs:
varnishd -V

[email protected]:/etc/nginx/sites-available# varnishd -V
varnishd (varnish-6.2.2 revision 3ed1506895ecaddb91f658bee11742f0b0b982b5)
Copyright (c) 2006 Verdens Gang AS
Copyright (c) 2006-2019 Varnish Software AS

systemctl status varnish

● varnish.service - Varnish Cache, a high-performance HTTP accelerator
   Loaded: loaded (/etc/systemd/system/varnish.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2021-02-09 15:30:19 CET; 19min ago
  Process: 18328 ExecStart=/usr/sbin/varnishd -a :80 -f /etc/varnish/default.vcl -s malloc,256m (code=exited, status=0/SUCCESS)
 Main PID: 18329 (varnishd)
    Tasks: 217
   CGroup: /system.slice/varnish.service
           ├─18329 /usr/sbin/varnishd -a :80 -f /etc/varnish/default.vcl -s malloc,256m
           └─18341 /usr/sbin/varnishd -a :80 -f /etc/varnish/default.vcl -s malloc,256m

Feb 09 15:30:19 userver systemd[1]: Stopped Varnish Cache, a high-performance HTTP accelerator.
Feb 09 15:30:19 userver systemd[1]: Starting Varnish Cache, a high-performance HTTP accelerator...
Feb 09 15:30:19 userver varnishd[18328]: Debug: Version: varnish-6.2.2 revision 3ed1506895ecaddb91f658bee11742f0b0b982b5
Feb 09 15:30:19 userver varnishd[18329]: Version: varnish-6.2.2 revision 3ed1506895ecaddb91f658bee11742f0b0b982b5
Feb 09 15:30:19 userver varnishd[18328]: Debug: Platform: Linux,4.15.0-121-generic,x86_64,-junix,-smalloc,-sdefault,-hcritbit
Feb 09 15:30:19 userver varnishd[18329]: Platform: Linux,4.15.0-121-generic,x86_64,-junix,-smalloc,-sdefault,-hcritbit
Feb 09 15:30:19 userver varnishd[18328]: Debug: Child (18341) Started
Feb 09 15:30:19 userver varnishd[18329]: Child (18341) Started
Feb 09 15:30:19 userver varnishd[18329]: Child (18341) said Child starts
Feb 09 15:30:19 userver systemd[1]: Started Varnish Cache, a high-performance HTTP accelerator.

systemctl start varnishncsa

[email protected]:/etc/nginx/sites-available# systemctl start varnishncsa
Job for varnishncsa.service failed because the control process exited with error code.
See "systemctl status varnishncsa.service" and "journalctl -xe" for details

systemctl status varnishncsa

● varnishncsa.service - Varnish Cache HTTP accelerator NCSA logging daemon
   Loaded: loaded (/lib/systemd/system/varnishncsa.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2021-02-09 15:37:56 CET; 13min ago
  Process: 18809 ExecStart=/usr/bin/varnishncsa -a -w /var/log/varnish/varnishncsa.log -D (code=exited, status=1/FAILURE)

Feb 09 15:37:51 userver systemd[1]: Starting Varnish Cache HTTP accelerator NCSA logging daemon...
Feb 09 15:37:56 userver varnishncsa[18809]: .....
Feb 09 15:37:56 userver varnishncsa[18809]: VSM: Could not get hold of varnishd, is it running?
Feb 09 15:37:56 userver systemd[1]: varnishncsa.service: Control process exited, code=exited status=1
Feb 09 15:37:56 userver systemd[1]: varnishncsa.service: Failed with result 'exit-code'.
Feb 09 15:37:56 userver systemd[1]: Failed to start Varnish Cache HTTP accelerator NCSA logging daemon.

And how to run it?