Traceback (most recent call last):
  File "./foobar.py", line 27, in <module>
    main()
  File "./foobar.py", line 19, in main
    sm.state.add_unit(new_unit)
  File "/home/kissiel/checkbox/plainbox/plainbox/impl/session/state.py", line 588, in add_unit
    return self._add_job_unit(new_unit, recompute)
  File "/home/kissiel/checkbox/plainbox/plainbox/impl/session/state.py", line 600, in _add_job_unit
    existing_job = self.job_state_map[new_job.id].job
AttributeError: 'Unit' object has no attribute 'id'