Failed to reload samba.service: Unit samba.service is masked.

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openATTIC's command log recorded 2 failed commands during the test period:
systemctl (2016-12-13T00:30:34.336 - 2016-12-13T00:30:34.344):
> "systemctl" "reload" "samba"
E Failed to reload samba.service: Unit samba.service is masked.

systemctl (2016-12-13T00:30:34.386 - 2016-12-13T00:30:34.396):
> "systemctl" "reload" "samba"
E Failed to reload samba.service: Unit samba.service is masked.

2016-12-13 10:45:23,954 - INFO - openattic_systemd#service_command - service_command(samba): invoking `systemctl reload samba`
2016-12-13 10:45:23,963 - ERROR - openattic_systemd#invoke - > "systemctl" "reload" "samba"
E Failed to reload samba.service: Unit samba.service is masked.
2016-12-13 10:45:23,964 - ERROR - openattic_systemd#_run_queue - Received error:
Traceback (most recent call last):
  File "/srv/openattic/backend/systemd/management/commands/runsystemd.py", line 117, in _run_queue
    func(scope, *args, **kwargs)
  File "/srv/openattic/backend/samba/systemapi.py", line 75, in reload
    return service_command(samba_settings.SERVICE_NAME, "reload")
  File "/srv/openattic/backend/systemd/procutils.py", line 135, in service_command
    invoke(['systemctl', command, service])
  File "/srv/openattic/backend/systemd/procutils.py", line 116, in invoke
    raise SystemError("%s failed: %s" % (cmdline, procerr))
SystemError: "systemctl" "reload" "samba" failed: Failed to reload samba.service: Unit samba.service is masked.