Description of problem:

Whenever I'm trying to run VM's on Fedora16 hosts I'm getting this error:
Thread-937::DEBUG::2012-02-21 17:46:58,761::vm::528::vm.Vm::(_startUnderlyingVm) vmId=`4d89445e-f563-441b-8a62-1599fed3b258`::_ongoingCreations released
Thread-937::ERROR::2012-02-21 17:46:58,764::vm::552::vm.Vm::(_startUnderlyingVm) vmId=`4d89445e-f563-441b-8a62-1599fed3b258`::The vm start process failed
Traceback (most recent call last):
  File "/usr/share/vdsm/vm.py", line 518, in _startUnderlyingVm
    self._run()
  File "/usr/share/vdsm/libvirtvm.py", line 1169, in _run
    self._connection.createXML(domxml, flags),
  File "/usr/share/vdsm/libvirtconnection.py", line 79, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 2100, in createXML
    if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self)



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