libvirt users - Jun 2010 - PCI Passthrough

Hi Everyone,

When I try and assign a physical device to a guest using virt-manager, 
libvirt throws an error:

"Failed to create inactive domain"

I'm using libvirt 0.8.1 which I compiled myself, along with Xen 4.0 on 
Ubuntu 10.04 Dom0

I'm also using virt-manager 0.8.4 which I compiled myself.

Any help would be appreciated

Thanks