python3 -m fmpy simulate --output-file BuildingSystems_BuildingSystems.Fluid.Examples.ResistanceVolumeFlowReversal_res.csv --start-time 0 --stop-time 10000 --timeout 50 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 4 BuildingSystems_BuildingSystems_Fluid_Examples_ResistanceVolumeFlowReversal.fmu LOG_NLS | error | residualFunc852: Iteration variable `(null)` is inf or nan. LOG_ASSERT | debug | residualFunc852 failed at time=7500.00000816415. | | | | For more information please use -lv LOG_NLS. LOG_STDOUT | warning | While solving non-linear system an assertion failed at time 7500. | | | | | 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