Environment - simulationEnvironment: startTime=0 stopTime=2 tolerance=1e-06 numberOfIntervals=2500 stepSize=0.0008 Regular simulation: ./ModelicaTest_3.2.3_ModelicaTest.MultiBody.FourbarVariants.JointUSR -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 = 1.797562: 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. In most cases it is best that the joints outside of the JointXXX component are revolute and NOT prismatic joints. If this also lead to singular positions, it could be that this kinematic loop cannot be solved analytically. 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 = 2.000000 ERROR : solver: SimManager: DASSL: solve failed with idid = 1 INFO : solver: SimManager: Simulation stop time: 2.000000 INFO : solver: Simulation info from solver: INFO : solver: DASSL: steps taken nst = 4598 INFO : solver: DASSL: residual evaluations nre = 4864 INFO : solver: DASSL: jacobian evaluations nje = 124 INFO : solver: DASSL: root evaluations nrt = 0 INFO : solver: DASSL: error test failures netf = 12 INFO : solver: DASSL: nonlinear convergence failures ncfn = 5 INFO : solver: DASSL: nonlinear iterations nni = 4864 INFO : solver: DASSL: last evaluation time t = 1.797562 INFO : solver: DASSL: last step size h = 0.000006 INFO : solver: DASSL: last used order k = 2 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 = 1.797562: 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. In most cases it is best that the joints outside of the JointXXX component are revolute and NOT prismatic joints. If this also lead to singular positions, it could be that this kinematic loop cannot be solved analytically. 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 = 2.000000 ERROR : solver: SimManager: DASSL: solve failed with idid = 1 INFO : solver: SimManager: Simulation stop time: 2.000000 INFO : solver: Simulation info from solver: INFO : solver: DASSL: steps taken nst = 4598 INFO : solver: DASSL: residual evaluations nre = 4864 INFO : solver: DASSL: jacobian evaluations nje = 124 INFO : solver: DASSL: root evaluations nrt = 0 INFO : solver: DASSL: error test failures netf = 12 INFO : solver: DASSL: nonlinear convergence failures ncfn = 5 INFO : solver: DASSL: nonlinear iterations nni = 4864 INFO : solver: DASSL: last evaluation time t = 1.797562 INFO : solver: DASSL: last step size h = 0.000006 INFO : solver: DASSL: last used order k = 2 ERROR : solver: SimController: Simulation failed using nonlinear solver kinsol