"400 Parameter verification failed." on removal of virtio device

Hi,

root@hv1:~# qm set 113 -delete virtio5
update VM 113: -delete virtio5
400 Parameter verification failed.
virtio5: hotplug problem - error on hot-unplugging device 'virtio5'


qm set <vmid> [OPTIONS]
root@hv1:~# qm config 113
bootdisk: virtio0
cores: 24
ide2: none,media=cdrom
memory: 32768
name: MIGRATOR
net0: e1000=XX:XX:XX:XX:XX:XX,bridge=vmbr0,rate=1000,tag =1
numa: 0
onboot: 1
ostype: l26
scsi5: rbd-testpool:vm-113-disk-2,cache=writeback,size=3584M
smbios1: uuid=20888310-e411-498c-9d0e-dadcad641d01
sockets: 1
unused0: rbd-proxmox-main:vm-113-disk-11
virtio0: rbd-proxmox-main:vm-113-disk-1,size=250G
virtio1: rbd-proxmox-main:vm-113-disk-3,cache=writethrough,size=20G
virtio10: rbd-proxmox-main:vm-113-disk-12,size=5120G
virtio2: rbd-proxmox-main:vm-113-disk-2,cache=writeback,size=42G
virtio3: rbd-proxmox-main:vm-113-disk-5,cache=none,size=34G
virtio4: rbd-proxmox-main:vm-113-disk-4,cache=writeback,size=5120G
virtio5: rbd-proxmox-main:vm-113-disk-6,size=1024G
virtio6: rbd-proxmox-main:vm-113-disk-8,size=2048G
virtio7: rbd-proxmox-main:vm-113-disk-7,size=3072G
virtio8: rbd-proxmox-main:vm-113-disk-9,size=3072G
virtio9: rbd-proxmox-main:vm-113-disk-10,size=3072G
root@hv1:~# qm config 113


root@hv1:~# pveversion -v
proxmox-ve-2.6.32: 3.4-156 (running kernel: 2.6.32-39-pve)
pve-manager: 3.4-6 (running version: 3.4-6/102d4547)
pve-kernel-2.6.32-39-pve: 2.6.32-156
pve-kernel-2.6.32-37-pve: 2.6.32-150
lvm2: 2.02.98-pve4
clvm: 2.02.98-pve4
corosync-pve: 1.4.7-1
openais-pve: 1.1.4-3
libqb0: 0.11.1-2
redhat-cluster-pve: 3.2.0-2
resource-agents-pve: 3.9.2-4
fence-agents-pve: 4.0.10-2
pve-cluster: 3.0-17
qemu-server: 3.4-6
pve-firmware: 1.1-4
libpve-common-perl: 3.0-24
libpve-access-control: 3.0-16
libpve-storage-perl: 3.0-33
pve-libspice-server1: 0.12.4-3
vncterm: 1.1-8
vzctl: 4.0-1pve6
vzprocps: 2.0.11-2
vzquota: 3.1-2
pve-qemu-kvm: 2.2-10
ksm-control-daemon: 1.1-1
glusterfs-client: 3.5.2-1
root@hv1:~#



Thanks!