if display_timing=True; error in _create_solvers()

[daluxer]

As far as I understand, this error is induced when having a non persistent solver. then no local_sit is written and thus consequently the code lines

all_set_instance_times = self.mpicomm.gather(local_sit,
                                                     root=0)
            if self.cylinder_rank == 0:
                asit = [sit for l_sit in all_set_instance_times for sit in l_sit]
                print("Set instance times:")
                print("\tmin=%4.2f mean=%4.2f max=%4.2f" %
                      (np.min(asit), np.mean(asit), np.max(asit)))

fail on np.min(asit), because all_set_instance_times is [] and consequently no np.min is possible.

If you turn display_timing=False, it's all good. But a bit tricky to find this error; as you'd start debugging why mpi-sppy doesn't find your solver

[DLWoodruff]

This seems to have been fixed about a year ago. Did you pip install a "released" version?
I think this bug will not bite if
git clone https://github.com/Pyomo/mpi-sppy
cd mpi-sppy
pip install -e .