How to create an error when creating a vzctl create virtual machine?

Question

OpenVZ

Previously, there were no such problems, a month ago, for example, I do everything similarly according to the script.
I'm trying to create a virtual machine

Error

vzctl create 3424  --ostemplate ubuntu-20.04-x86_64
Cached package set 'ubuntu-20.04-x86_64' is not found, run create cache utility...
Creating OS template cache for ubuntu-20.04-x86_64 template
Device md0 not found
Error: Failed to create ploop image /vz/tmp//vzpkg.oOirMA/cache-private/root.hdd/root.hds: Error in ploop_umount (ploop.c:2753): Failed to find top delta name and format 2
Error: Cannot create ploop device
Error: Failed to read ploop disk descriptor /vz/tmp//vzpkg.oOirMA/cache-private/root.hdd: Error in ploop_open_dd (di.c:364): Can't resolve /vz/tmp//vzpkg.oOirMA/cache-private/root.hdd/DiskDescriptor.xml: No such file or directory 39
VE_PRIVATE is not set
Creation of Container private area failed

System information

[[email protected] ~]# df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
devtmpfs       devtmpfs   16G     0   16G   0% /dev
tmpfs          tmpfs      16G     0   16G   0% /dev/shm
tmpfs          tmpfs      16G  476K   16G   1% /run
tmpfs          tmpfs      16G     0   16G   0% /sys/fs/cgroup
/dev/md2       ext4      423G  2.7G  398G   1% /
/dev/md1       ext3      487M  210M  252M  46% /boot
tmpfs          tmpfs     3.2G     0  3.2G   0% /run/user/0

[[email protected] ~]# cat /etc/centos-release
CentOS Linux release 7.8.2003 (Core)