Error when restoring "failed: can't lock file"

[tomc]

Hi
When trying to restore a couple of backups I get the following.
"
trying to aquire lock...TASK ERROR: command 'lzop -d -c /media/cm-back01/dump/vzdump-qemu-201-2016_08_19-21_30_02.vma.lzo|vma extract -v -r /var/tmp/vzdumptmp70381.fifo - /var/tmp/vzdumptmp70381' failed: can't lock file '/var/lock/pve-manager/pve-storage-CMbackup' - got timeout"

Proxmox VE: 3.4-13/4c745357

Backup is on Local Directory,