I proposed a fix at https://review.openstack.org/355415 and your error message comes from the same location, so I think it should fix your problem, too. See also the similar bug report https://bugs.launchpad.net/nova/+bug/1610015
I proposed a fix at https:/ /review. openstack. org/355415 and your error message comes from the same location, so I think it should fix your problem, too. See also the similar bug report https:/ /bugs.launchpad .net/nova/ +bug/1610015