backup job error no space left on device but there is space.

INFO: starting new backup job: vzdump --fleecing 0 --storage pbs0 --all 1 --quiet 1 --notes-template '{{node}} - {{vmid}} - {{guestname}}' --mode snapshot
INFO: Starting Backup of VM 100 (lxc)
INFO: Backup started at 2025-01-17 00:00:05
INFO: status = running
INFO: CT Name: PlexMediaServer
INFO: including mount point rootfs ('/') in backup
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: create storage snapshot 'vzdump'
INFO: creating...