Unable to complete install: 'virDomainCreateLinux() failed POST operation failed: (xend.err 'Device 0 (vif) could not be connected. Backend device not found.')'



Unable to complete install 'libvirt.libvirtError virDomainCreateLinux() failed POST operation failed: (xend.err 'Device 0 (vif) could not be connected. Backend device not found.')
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/create.py", line 699, in do_install
    dom = guest.start_install(False, meter = meter)
  File "/export/builds/xvm_85/proto/install/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 638, in start_install
  File "/export/builds/xvm_85/proto/install/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 655, in _do_install
  File "libvirt.py", line 585, in createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: virDomainCreateLinux() failed POST operation failed: (xend.err 'Device 0 (vif) could not be connected. Backend device not found.')
'