libvirt users - Mar 2012 - Solution for Address family not supported by protocol

I just upgrade to the last version of the libvirt on my Gentoo System. 
(From 0.9.6 to 0.9.10-r3) But i have a problem with starting my NAT:

Error starting network 'NAT': Cannot open network interface control 
socket: Address family not supported by protocol

Traceback (most recent call last):
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in
cb_wrapper
     callback(asyncjob, *args, **kwargs)
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 66, in
tmpcb
     callback(*args, **kwargs)
   File "/usr/share/virt-manager/virtManager/network.py", line 82, in
start
     self.net.create()
   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1863, in
create
     if ret == -1: raise libvirtError ('virNetworkCreate() failed', 
net=self)
libvirtError: Cannot open network interface control socket: Address 
family not supported by protocol

Anyone have an idea how to fix this? I try also to add a new adapter by 
hand, but know seems to work her....

so far
4k3nd0