Overcloud Deployment Failing

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I am trying to deploy RHOSP16.1 , Stack is getting deployed after that its is giving below error.
Stack overcloud15/6e0db967-2d15-4dbc-8436-f3cf0f0e999e CREATE_COMPLETE

Waiting for messages on queue 'tripleo' with no timeout.
Exception occured while running the command
Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/tripleoclient/command.py", line 32, in run
super(Command, self).run(parsed_args)
File "/usr/lib/python3.6/site-packages/osc_lib/command/command.py", line 41, in run
return super(Command, self).run(parsed_args)
File "/usr/lib/python3.6/site-packages/cliff/command.py", line 185, in run
return_code = self.take_action(parsed_args) or 0
File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 1125, in take_action
self._deploy_postconfig(stack, parsed_args)
File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 573, in _deploy_postconfig
[x for x in no_proxy_list if x is not None])
File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 573, in
[x for x in no_proxy_list if x is not None])
File "/usr/lib/python3.6/site-packages/tripleoclient/utils.py", line 428, in bracket_ipv6
socket.inet_pton(socket.AF_INET6, address)
TypeError: inet_pton() argument 2 must be str, not None
inet_pton() argument 2 must be str, not None

Please help me out on priority.

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