[libvirt-users] virsh iface-list fail

Hi all, I'm using libvirt 1.1.1 on my ubuntu 13.10 minimal. When I try a virsh iface-list i get this message: error: Failed to list interfaces error: internal error: failed to get number of host interfaces I create a BR0 thru my ETH0. On my virt-manager i don't see the computer interfaces What could it be? Thanks