I tried disabling apparmor, but still getting the same error.
# pct config 111
arch: amd64
cores: 4
description: plex, tautulli
features: nesting=1
hostname: plex
memory: 4096
net0: name=eth0,bridge=vmbr0,hwaddr=0E:D4:06:C3:8F:4E,ip=dhcp,type=veth
onboot: 1
ostype: ubuntu
rootfs...