Recently built a three host HCI with oVirt node 4.2.5.  I am seeing the following error in each hosts syslog often.  What does it mean and how can it be corrected?

vdsm[3470]: ERROR Internal server error#012Traceback (most recent call last):#012  File "/usr/lib/python2.7/site-packages/yajsonrpc/__init__.py", line 606, in _handle_request#012    res = method(**params)#012  File "/usr/lib/python2.7/site-packages/vdsm/rpc/Bridge.py", line 197, in _dynamicMethod#012    result = fn(*methodArgs)#012  File "/usr/lib/python2.7/site-packages/vdsm/gluster/apiwrapper.py", line 91, in vdoVolumeList#012    return self._gluster.vdoVolumeList()#012  File "/usr/lib/python2.7/site-packages/vdsm/gluster/api.py", line 90, in wrapper#012    rv = func(*args, **kwargs)#012  File "/usr/lib/python2.7/site-packages/vdsm/gluster/api.py", line 818, in vdoVolumeList#012    status = self.svdsmProxy.glusterVdoVolumeList()#012  File "/usr/lib/python2.7/site-packages/vdsm/common/supervdsm.py", line 55, in __call__#012    return callMethod()#012  File "/usr/lib/python2.7/site-packages/vdsm/common/supervdsm.py", line 53, in <lambda>#012    **kwargs)#012  File "<string>", line 2, in glusterVdoVolumeList#012  File "/usr/lib64/python2.7/multiprocessing/managers.py", line 773, in _callmethod#012    raise convert_to_error(kind, result)#012AttributeError: 'str' object has no attribute 'iteritems'