[Samba] Demote a working DC fails with uncaught exception

[spindles7]

Hi all,
I am consistently getting the error:

root at dc2:~# samba-tool domain demote -Uadministrator
Using dc1.microlynx.com as partner server for the demotion
Password for [MICROLYNX\administrator]:
Deactivating inbound replication
Asking partner server dc1.microlynx.com to synchronize from us
Changing userControl and container
ERROR(<type 'exceptions.TypeError'>): uncaught exception - remove_sysvol_references() takes exactly 3 arguments (2 given)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/__init__.py", line 175, in _run
    return self.run(*args, **kwargs)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/domain.py", line 943, in run
    remove_dc.remove_sysvol_references(remote_samdb, dc_name)
root at dc2:~#

Samba version is 4.4.0 running on Debian Jessie.    Replication was working OK before the demotion attempt as was SysVol replication
and samba-tool ntacl sysvolcheck produced no errors.   All 7 FSMO roles reside on dc1.

Was able to remove the DC by using the --remove-other-dead-server option.

Any ideas how to troubleshoot this problem?

Thanks,

spindles7