VM Manager ERROR: "libvirtError: internal error: client socket is closed"

[danmich...@gmail.com]

I installed the debian and whonix templates

But then, whenever I open VM Manager, I get the following error:

"Whoops. A critical error has occured. This is most likely a bug in Qubes Manager.

libvirtError: internal error: client socket is closed at line 1268 of the file libvirt.py"

....

Not only this.. but when I click OK, i can browse the VMs.. but I can't attach USB devices to them....

....

So... what is the solution here...? Do I Just need to restart the Qubes system.. or has something else gone wrong entirely...?