uwSGI as service

Version: Linux: Ubuntu 20.04.3 LTS uwsgi: 2.0.18-debian

I have this config "/etc/uwsgi/lemonldap.ini":

[uwsgi]
plugins = psgi
socket = 127.0.0.1:5000
psgi = /usr/share/lemonldap-ng/llng-server/llng-server.psgi
master = true
processes = 5
single-interpreter = true
uid = www-data
gid = www-data
vacuum = true
daemonize=/var/log/lemonldap-ng/lemonldap_trace.log
chown-socket = www-data:www-data
chmod-socket = 660

This config work when I use command "uwsgi --ini /etc/uwsgi/lemonldap.ini" I make service config:

[Unit]
    Description=LemonLdap
[Service]
    Environment=LLNG_DEFAULTCONFFILE=/etc/lemonldap-ng/lemonldap-ng.ini
    ExecStart=/usr/bin/uwsgi --ini /etc/uwsgi/lemonldap.ini
    KillSignal=SIGQUIT
    Type=forking
    NotifyAccess=all
    User=www-data
    Group=www-data
[Install]
    WantedBy=multi-user.target

I try start it, but get:

● ulemonldap.service - LemonLdap
     Loaded: loaded (/lib/systemd/system/ulemonldap.service; enabled; vendor preset: enabled)
     Active: inactive (dead) since Tue 2021-11-23 02:25:05 UTC; 3min 18s ago
    Process: 319431 ExecStart=/usr/bin/uwsgi --ini /etc/uwsgi/lemonldap.ini (code=exited, status=0/SUCCESS)
   Main PID: 319441 (code=exited, status=0/SUCCESS)
     Status: "initializing uWSGI"

Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Failed to read oom_kill field of memory.events cgroup attribute: No such file o
r directory
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Child 319441 belongs to ulemonldap.service.
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Main process exited, code=exited, status=0/SUCCESS
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Changed running -> stop-sigterm
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Failed to read oom_kill field of memory.events cgroup attribute: No such file or directory
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Child 319442 belongs to ulemonldap.service.
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Control group is empty.
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Succeeded.
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Service will not restart (restart setting)
Nov 23 02:25:05 rproxy systemd[1]: ulemonldap.service: Changed stop-sigterm -> dead

On version "Ubuntu 20.04.1 LTS" and "uwsgi: 2.0.18-debian", almost identical service (diff only user) work without problem.

What am I doing wrong? And what does it mean: "Failed to read oom_kill field of memory.events cgroup attribute: No such file or directory"