Why Hosted Engine setup failed with error: "could not find capabilities for arch=x86_64".?

Issue

• There is following error in log file /var/log/vdsm/vdsm.log:

Thread-72::ERROR::2017-04-18 20:12:04,027::vm::773::virt.vm::(_startUnderlyingVm) vmId=`vm_ID`::The vm start process failed
Traceback (most recent call last):
  File "/usr/share/vdsm/virt/vm.py", line 714, in _startUnderlyingVm
    self._run()
  File "/usr/share/vdsm/virt/vm.py", line 2026, in _run
    self._connection.createXML(domxml, flags),
  File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py", line 123, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/utils.py", line 917, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3777, in createXML
    if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self)
libvirtError: invalid argument: could not find capabilities for arch=x86_64 domaintype=kvm 
Thread-72::INFO::2017-04-18 20:12:04,032::vm::1330::virt.vm::(setDownStatus) vmId=`vm_ID`::Changed state to Down: invalid argument: could not find capabilities for arch=x86_64 domaintype=kvm  (code=1)