projman #8341 --type simple crashes [open]

$ projman schedule  -f project.xml --type simple
Problem valid
Traceback (most recent call last):
 File "/home/alf/dev/public/projman/bin/projman", line 4, in <module>
   run(sys.argv[1:])
 File "/home/alf/dev/public/projman/main.py", line 24, in run
   main_run(args, __doc__)
 File "/home/alf/dev/public/logilab/common/clcommands.py", line 136, in main_run
   cmd_run(arg, *args)
 File "/home/alf/dev/public/logilab/common/clcommands.py", line 119, in cmd_run
   command.run(args)
 File "/home/alf/dev/public/projman/commands.py", line 80, in run
   self._run(args)
 File "/home/alf/dev/public/projman/commands.py", line 131, in _run
   schedule(self.project, self.config)
 File "/home/alf/dev/public/projman/scheduling/__init__.py", line 54, in schedule
   errors += scheduler.schedule(verbose=config.verbose, time=config.time)
 File "/home/alf/dev/public/projman/scheduling/simple.py", line 142, in schedule
   for bucket in self.get_ordered_buckets():
 File "/home/alf/dev/public/projman/scheduling/simple.py", line 123, in get_ordered_buckets
   tasks.sort(cmp_tasks)
 File "/home/alf/dev/public/projman/scheduling/simple.py", line 44, in cmp_tasks
   for constraint_type, task_id in task_a.get_task_constraints():
ValueError: too many values to unpack
prioritynormal
typebug
done in0.17.0
closed by<not specified>