(cd run_fmpy-fmi3-cs-cvode && python3 -m fmpy simulate --output-file ../Buildings_12_Buildings.Examples.DualFanDualDuct.ClosedLoop_fmpy-fmi3-cs-cvode_res.csv --output-variables fanSupHot.m_flow fanSupCol.m_flow fanRet.m_flow fanSupHot.dp fanSupCol.dp fanRet.dp flo.sou.air.vol.T flo.eas.air.vol.T flo.nor.air.vol.T flo.wes.air.vol.T flo.cor.air.vol.T cor.vavHot.m_flow sou.vavHot.m_flow eas.vavHot.m_flow nor.vavHot.m_flow wes.vavHot.m_flow cor.vavCol.m_flow sou.vavCol.m_flow eas.vavCol.m_flow nor.vavCol.m_flow wes.vavCol.m_flow weaDat.weaBus.TDryBul weaDat.weaBus.HGloHor weaDat.weaBus.HDifHor conEco.VOut_flow_min conEco.VOut_flow conEco.yOA conEco.yOATFre.y conEco.conV_flow.y conEco.uOATSup --start-time 0 --stop-time 172800 --timeout 390 --relative-tolerance 1e-06 --interface-type CoSimulation --output-interval 69.12 ../Buildings_12_Buildings_Examples_DualFanDualDuct_ClosedLoop_fmpy-fmi3-cs-cvode.fmu)
LOG_STDOUT        | warning | While solving non-linear system an assertion failed at time 20118.4.
|                 | |       | | The non-linear solver tries to solve the problem that could take some time.
|                 | |       | | It could help to provide better start-values for the iteration variables.
|                 | |       | | For more information simulate with -lv LOG_NLS_V
LOG_STDOUT        | info    | ##CVODE## -1 error occurred at time = 36902.5802134366
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/opt/libtest-venv/lib/python3.14/site-packages/fmpy/__main__.py", line 4, in <module>
    main()
    ~~~~^^
  File "/opt/libtest-venv/lib/python3.14/site-packages/fmpy/cli.py", line 186, in main
    result = simulate_fmu(args.fmu_filename,
                          validate=args.validate,
    ...<14 lines>...
                          visible=args.visible,
                          fmi_call_logger=fmi_call_logger)
  File "/opt/libtest-venv/lib/python3.14/site-packages/fmpy/simulation.py", line 801, in simulate_fmu
    result = simulateCS(model_description, fmu, start_time, stop_time, relative_tolerance, start_values, apply_default_start_values, input, output, output_interval, timeout, step_finished, set_input_derivatives, use_event_mode, early_return_allowed, validate, initialize, terminate, set_stop_time)
  File "/opt/libtest-venv/lib/python3.14/site-packages/fmpy/simulation.py", line 1350, in simulateCS
    event_encountered, terminate_simulation, early_return, last_successful_time = fmu.doStep(currentCommunicationPoint=time, communicationStepSize=step_size)
                                                                                  ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/libtest-venv/lib/python3.14/site-packages/fmpy/fmi3.py", line 1968, in doStep
    self.fmi3DoStep(
    ~~~~~~~~~~~~~~~^
        self.component,
        ^^^^^^^^^^^^^^^
    ...<6 lines>...
        byref(lastSuccessfulTime),
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/libtest-venv/lib/python3.14/site-packages/fmpy/fmi3.py", line 1268, in fmi3DoStep
    return self._call(
           ~~~~~~~~~~^
        "fmi3DoStep",
        ^^^^^^^^^^^^^
    ...<7 lines>...
        lastSuccessfulTime,
        ^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/opt/libtest-venv/lib/python3.14/site-packages/fmpy/fmi1.py", line 369, in _call
    raise FMICallException(function=fname, status=res)
fmpy.fmi1.FMICallException: fmi3DoStep failed with status 4 (fatal).