Cmd/lxc_user_nic.c: 192: get_groupnames: Failed to get group members

Hello, its me again.
Im still trying to run an lxc unprivileged container with my corporative ubuntu build. But when im trying to run it, I got a mistake.

Version: 1:4.0.3+master~20200728-1140-0ubuntu1~bionic

lxc-start -d -n MyContainer -f ~/.config/lxc/default.conf --logfile /var/log/lxc/lxc_conf.log

    lxc-start MyContainer 20200803142626.468 ERROR    utils - utils.c:lxc_can_use_pidfd:1834 - Kernel does not support pidfds
    lxc-start MyContainer 20200803142626.579 ERROR    network - network.c:lxc_create_network_unpriv_exec:2945 - lxc-user-nic failed to configure requested network: cmd/lxc_user_nic.c: 192: get_groupnames: Failed to get group members: 20001
    lxc-start MyContainer 20200803142626.579 ERROR    start - start.c:lxc_spawn:1853 - Failed to create the network
    lxc-start MyContainer 20200803142626.580 ERROR    lxccontainer - lxccontainer.c:wait_on_daemonized_start:850 - Received container state "ABORTING" instead of "RUNNING"
    lxc-start MyContainer 20200803142626.580 ERROR    lxc_start - tools/lxc_start.c:main:308 - The container failed to start
    lxc-start MyContainer 20200803142626.580 ERROR    lxc_start - tools/lxc_start.c:main:311 - To get more details, run the container in foreground mode
    lxc-start MyContainer 20200803142626.581 ERROR    lxc_start - tools/lxc_start.c:main:314 - Additional information can be obtained by setting the --logfile and --logpriority options
    lxc-start MyContainer 20200803142626.582 ERROR    start - start.c:__lxc_start:2074 - Failed to spawn container "MyContainer"

I think that it is related with a huuuuuge amount of members in this group… but what I can make with this?