Hi everyone，

I add weight load on the shank. First， I add weight load in walk, this problem didn't occur. Then, I add weight load in squat.The problem occur:

Progressing to solve kinematic optimality conditions and hard constraints.

Progressing to solve kinematic optimality conditions and hard constraints.

Progressing to solve kinematic optimality conditions and hard constraints.

Progressing to solve kinematic optimality conditions and hard constraints.

Failed to solve kinematic optimality conditions and hard constraints after 5 fallback attemps.

Constraint violations for study 'Main.Studies.ParameterIdentification.KinematicStudyForParameterIdentification' :

Constraint #111 is above tolerance 1e-05, error = 0.000148, constr. #3 in 'Main.HumanModel.BodyModel.Left.Leg.Jnt.Ankle.Constraints'.

Constraint #112 is above tolerance 1e-05, error = 0.000082, constr. #4 in 'Main.HumanModel.BodyModel.Left.Leg.Jnt.Ankle.Constraints'.

Constraint #114 is above tolerance 1e-05, error = 0.000025, constr. #1 in 'Main.HumanModel.BodyModel.Left.Leg.Jnt.SubTalar.Constraints'.

Constraint #115 is above tolerance 1e-05, error = 0.000011, constr. #2 in 'Main.HumanModel.BodyModel.Left.Leg.Jnt.SubTalar.Constraints'.

Constraint #116 is above tolerance 1e-05, error = 0.000266, constr. #3 in 'Main.HumanModel.BodyModel.Left.Leg.Jnt.SubTalar.Constraints'.

Constraint #117 is above tolerance 1e-05, error = 0.000226, constr. #4 in 'Main.HumanModel.BodyModel.Left.Leg.Jnt.SubTalar.Constraints'.

Constraint #303 is above tolerance 1e-05, error = 0.000678, segment constr. 'Main.HumanModel.BodyModel.Left.Leg.Seg.Talus'.

Constraint #304 is above tolerance 1e-05, error = 0.000481, segment constr. 'Main.HumanModel.BodyModel.Left.Leg.Seg.Foot'.

Constraint #305 is above tolerance 1e-05, error = 0.000067, segment constr. 'Main.HumanModel.BodyModel.Left.Leg.Seg.Shank'.

Constraint #306 is above tolerance 1e-05, error = 0.000067, segment constr. 'Main.HumanModel.BodyModel.Left.Leg.Seg.Thigh'.

Constraint #307 is above tolerance 1e-05, error = 0.000068, segment constr. 'Main.HumanModel.BodyModel.Left.Leg.Seg.Patella'.

ERROR(OBJ.MCH.KIN3) : C:/U..s/a..n/D..s/A..x/A..e/T..s/A..p/KinematicStudyForParameterIdentification.any(11) : KinematicStudyForParameterIdentification.InitialConditions : Kinematic analysis failed in time step 0 : Position analysis is not completed

I adjusted the initial position, but this didn't work.I attached the zip file to make it easier for everyone to help me find the cause of the error. I really appreciate if anyone could help me.

Best regards.

Xuan Guo

Plug-in-gait_Simple2.zip (258.2 KB)