Proxmox. ERROR: Backup of VM failed - CT is locked (backup)

Question

I tried to create backup of the container (LXC) in my Proxmox and I get the error:

INFO: starting new backup job: vzdump 206 --node my_server --mode snapshot --storage backups-stor --remove 0 --compress lzo
INFO: Starting Backup of VM 206 (lxc)
INFO: status = running
ERROR: Backup of VM 206 failed - CT is locked (backup)
INFO: Backup job finished with errors
TASK ERROR: job errors

I many search the Internet and found the advices with command:

qm unlock <VM ID>

But when I execute this command on my server:

qm unlock 206

I got error message:

Configuration file 'nodes/myserver/qemu-server/206.conf' does not exist

How can I unblock my VM to create a backup?

Solution

I solved my problem. qm manages the qemu VMs while pct is for containers (lxc). For unlock containers need to use command:

pct unlock <ID>

in my case:

pct unlock 206