python3 -m fmpy simulate  --output-file BuildingSystems_BuildingSystems.Electrical.AC.ThreePhasesUnbalanced.Validation.IEEETests.Test4NodesFeeder.UnbalancedStepDown.DD_res.csv --start-time 0 --stop-time 1 --timeout 50 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 0.0004 BuildingSystems_BuildingSystems_Electrical_AC_ThreePhasesUnbalanced_Validation_IEEETests_Test4NodesFeeder_UnbalancedStepDown_DD.fmu
LOG_STDOUT        | warning | Error solving linear system of equations (no. 755) at time 0.000000.
LOG_STDOUT        | warning | Solving linear system 755 fails at time 0. For more information use -lv LOG_LS.
LOG_ASSERT        | debug   | Solving linear system 755 failed at time=0.
|                 | |       | For more information please use -lv LOG_LS.
LOG_ASSERT        | error   | Failed to solve the initialization problem with global homotopy with equidistant step size.
LOG_ASSERT        | debug   | Unable to solve initialization problem.
Traceback (most recent call last):
  File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.10/dist-packages/fmpy/__main__.py", line 4, in <module>
    main()
  File "/usr/local/lib/python3.10/dist-packages/fmpy/command_line.py", line 167, in main
    result = simulate_fmu(args.fmu_filename,
  File "/usr/local/lib/python3.10/dist-packages/fmpy/simulation.py", line 759, in simulate_fmu
    result = simulateME(model_description, fmu, start_time, stop_time, solver, step_size, relative_tolerance, start_values, apply_default_start_values, input, output, output_interval, record_events, timeout, step_finished, validate, set_stop_time)
  File "/usr/local/lib/python3.10/dist-packages/fmpy/simulation.py", line 933, in simulateME
    fmu.exitInitializationMode()
  File "/usr/local/lib/python3.10/dist-packages/fmpy/fmi2.py", line 280, in exitInitializationMode
    return self.fmi2ExitInitializationMode(self.component)
  File "/usr/local/lib/python3.10/dist-packages/fmpy/fmi2.py", line 215, in w
    raise FMICallException(function=fname, status=res)
fmpy.fmi1.FMICallException: fmi2ExitInitializationMode failed with status 3 (error).