Opensim 4.0 : CMC Failed

[Yang Jingbang]

Hi, OpesnSim experts
I have performed scale, IK, ID, and RRA, but failed when I ran CMC. The message is as follows.



taskSet size = 29

Storage: read data file =run_2p52_grf.mot (nr=3400 nc=19)
ExternalForce::right
Data source being set to run_2p52_grf.mot
ExternalForce::left
Data source being set to run_2p52_grf.mot
CMC::Warning: CMC cannot compute controls for muscles with muscle controls < 0.02.
The minimum control limit for muscle 'TRIlong' has been reset to 0.02.
CMC::Warning: CMC cannot compute controls for muscles with muscle controls < 0.02.
The minimum control limit for muscle 'TRIlat' has been reset to 0.02.
CMC::Warning: CMC cannot compute controls for muscles with muscle controls < 0.02.
......
The minimum control limit for muscle 'intobl_l' has been reset to 0.02.
CMC::Warning: CMC cannot compute controls for muscles with muscle controls < 0.02.
The minimum control limit for muscle 'extobl_r' has been reset to 0.02.
CMC::Warning: CMC cannot compute controls for muscles with muscle controls < 0.02.
The minimum control limit for muscle 'extobl_l' has been reset to 0.02.


WARN- a desired points file was not specified.

Note- not filtering the desired kinematics.

CMC.computeControls: t = 0
SimTK Exception thrown at interiorpointoptimizer.cpp:264:
Optimizer failed: Ipopt: Infeasible problem detected (status 2)
OPTIMIZATION FAILED...

CMC.computeControls: ERROR- Optimizer could not find a solution.
Unable to find a feasible solution at time = 0.
Model cannot generate the forces necessary to achieve the target acceleration.
Possible issues: 1. not all model degrees-of-freedom are actuated,
2. there are tracking tasks for locked coordinates, and/or
3. there are unnecessary control constraints on reserve/residual actuators.

[Carmichael Ong]

It's difficult to diagnose from this information alone. I would suggest trying out the 3 suggested steps at the end of the message (these are the high-priority things to check when CMC fails).