Error polling connection 'qemu:///system': internal error Cannot find suitable emulator for x86_64

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/engine.py", line 440, in _tick
    conn.tick()
  File "/usr/share/virt-manager/virtManager/connection.py", line 1422, in tick
    newNets, self.nets) = self._update_nets()
  File "/usr/share/virt-manager/virtManager/connection.py", line 1285, in _update_nets
    lookup_func, build_class)
  File "/usr/share/virt-manager/virtManager/connection.py", line 1217, in _poll_helper
    if not check_support():
  File "/usr/share/virt-manager/virtManager/connection.py", line 509, in is_network_capable
    virtinst.support.SUPPORT_CONN_NETWORK)
  File "/usr/lib/python2.6/site-packages/virtinst/support.py", line 574, in check_conn_support
    return _check_support(conn, feature, conn)
  File "/usr/lib/python2.6/site-packages/virtinst/support.py", line 443, in _check_support
    actual_drv_ver = _hv_ver(conn, uri)
  File "/usr/lib/python2.6/site-packages/virtinst/support.py", line 376, in _hv_ver
    ret = cmd(*args)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 3191, in getVersion
    if ret == -1: raise libvirtError ('virConnectGetVersion() failed', conn=self)
libvirtError: internal error Cannot find suitable emulator for x86_64