Environment - simulationEnvironment: startTime=0 stopTime=4 tolerance=1e-06 numberOfIntervals=2500 stepSize=0.0016 Regular simulation: ./ModelicaTest_4.0.0_ModelicaTest.MultiBody.Joints.JointUSP2 -abortSlowSimulation -alarm=480 -emit_protected -lv LOG_STATS WARNING: other : Warning: unrecognized command line options -abortSlowSimulation INFO : solver: SimManager: Start initialization INFO : solver: SimManager: Start simulation at t = 0.000000 ERROR : solver: DASSL: failed step at t = 0.823857: 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. ERROR : solver: SimManager: Simulation stopped with errors before t = 4.000000 ERROR : solver: SimManager: DASSL: solve failed with idid = 1 INFO : solver: SimManager: Simulation stop time: 4.000000 INFO : solver: Simulation info from solver: INFO : solver: DASSL: steps taken nst = 1100 INFO : solver: DASSL: residual evaluations nre = 1117 INFO : solver: DASSL: jacobian evaluations nje = 71 INFO : solver: DASSL: root evaluations nrt = 1101 INFO : solver: DASSL: error test failures netf = 0 INFO : solver: DASSL: nonlinear convergence failures ncfn = 0 INFO : solver: DASSL: nonlinear iterations nni = 1117 INFO : solver: DASSL: last evaluation time t = 0.823857 INFO : solver: DASSL: last step size h = 0.000800 INFO : solver: DASSL: last used order k = 5 ERROR : solver: SimController: Simulation failed using nonlinear solver newton ERROR : solver: SimController: Recovering with nonlinear solver kinsol INFO : solver: SimManager: Start initialization INFO : solver: SimManager: Start simulation at t = 0.000000 ERROR : solver: DASSL: failed step at t = 0.823857: 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. ERROR : solver: SimManager: Simulation stopped with errors before t = 4.000000 ERROR : solver: SimManager: DASSL: solve failed with idid = 1 INFO : solver: SimManager: Simulation stop time: 4.000000 INFO : solver: Simulation info from solver: INFO : solver: DASSL: steps taken nst = 1100 INFO : solver: DASSL: residual evaluations nre = 1117 INFO : solver: DASSL: jacobian evaluations nje = 71 INFO : solver: DASSL: root evaluations nrt = 1101 INFO : solver: DASSL: error test failures netf = 0 INFO : solver: DASSL: nonlinear convergence failures ncfn = 0 INFO : solver: DASSL: nonlinear iterations nni = 1117 INFO : solver: DASSL: last evaluation time t = 0.823857 INFO : solver: DASSL: last step size h = 0.000800 INFO : solver: DASSL: last used order k = 5 ERROR : solver: SimController: Simulation failed using nonlinear solver kinsol