python3 -m fmpy simulate  --output-file ModelicaTest_4.0.0_ModelicaTest.MultiBody.Joints.JointUSP2_res.csv --start-time 0 --stop-time 4 --timeout 50 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 0.0016 ModelicaTest_4_0_0_ModelicaTest_MultiBody_Joints_JointUSP2.fmu
LOG_ASSERT        | error   | [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/Mechanics/MultiBody/Joints/Internal/PrismaticWithLengthConstraint.mo:174:3-185:3:writable]
|                 | |       | The following assertion has been violated at time 3.035200
|                 | |       | ((noEvent(jointUSP.prismatic.k1a > 1e-10))) --> "
|                 | |       | Singular position of loop (either no or two analytic solutions;
|                 | |       | the mechanism has lost one-degree-of freedom in this position).
|                 | |       | Try first to use another Modelica.Mechanics.MultiBody.Joints.Assemblies.JointXXX component.
|                 | |       | If this also lead to singular positions, it could be that this
|                 | |       | kinematic loop cannot be solved analytically with a fixed state
|                 | |       | selection. In this case you have to build up the loop with
|                 | |       | basic joints (NO aggregation JointXXX components) and rely on
|                 | |       | dynamic state selection, i.e., during simulation the states will
|                 | |       | be dynamically selected in such a way that in no position a
|                 | |       | degree of freedom is lost.
|                 | |       | "
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 1076, in simulateME
    step_event, _ = fmu.completedIntegratorStep()
  File "/usr/local/lib/python3.10/dist-packages/fmpy/fmi2.py", line 491, in completedIntegratorStep
    self.fmi2CompletedIntegratorStep(self.component, noSetFMUStatePriorToCurrentPoint, byref(enterEventMode), byref(terminateSimulation))
  File "/usr/local/lib/python3.10/dist-packages/fmpy/fmi2.py", line 215, in w
    raise FMICallException(function=fname, status=res)
fmpy.fmi1.FMICallException: fmi2CompletedIntegratorStep failed with status 3 (error).