"Failed to save domain" when trying to create Whonix DisposableVMs.

[Lolint]

Good day,

I've been trying to create Whonix Disposable VMs based on, https://www.whonix.org/wiki/Qubes/Disposable_VM#Creating_a_new_DisposableVM-Template_based_on_Whonix-Workstation but there is a problem I encounter with the very first step when typing

qvm-create-default-dvm whonix-ws

in the dom0 terminal. I get (skipped some lines):

Connecting to VM's GUI agent: .......connected

Waiting for DVM whonix-ws-dvm ...

/qubes-used-mem

Disk detached successfully

DVM book complete, memory used=509576. Saving image...

error: Failed to save domain whonix-ws-dvm to /var/lib/qubes/appvms/whonix-ws-dvm/dvm-savefile

error: internal error: Failed to save domain '11' with libxenlight

How can I fix this?

Thx,

--Jeff