vdsm-grafton-3 error

2018-10-23 10:06:50,383+0530 ERROR (MainThread) [vds] Exception raised (vdsmd:158)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/vdsmd.py", line 156, in run
    serve_clients(log)
  File "/usr/lib/python2.7/site-packages/vdsm/vdsmd.py", line 124, in serve_clients
    cif.prepareForShutdown()
  File "/usr/lib/python2.7/site-packages/vdsm/clientIF.py", line 389, in prepareForShutdown
    secret.clear()
  File "/usr/lib/python2.7/site-packages/vdsm/virt/secret.py", line 93, in clear
    for virsecret in con.listAllSecrets():
  File "/usr/lib/python2.7/site-packages/vdsm/common/libvirtconnection.py", line 149, in wrapper
    __connections.get(id(target)).pingLibvirt()
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3836, in getLibVersion
    if ret == -1: raise libvirtError ('virConnectGetLibVersion() failed', conn=self)
libvirtError: internal error: client socket is closed