Error message CMC

[Anna Ventura]

Good morning,
I am trying to compute the CMC using xml files created modifying the already present in OpenSim 3.3 but I am having some problems. I think I have done alla correctly but when I run, it exits this message error after a list of actuators with the warning message below:
SCMC.computeControls: t = 5
CMC::computeControls WARNING- small force range for ECU (200.834 to 200.834)

CMC::computeControls WARNING- small force range for elv_angle_reserve (0.02 to 1)

CMC::computeControls WARNING- small force range for shoulder_elv_reserve (0.02 to 1)

CMC::computeControls WARNING- small force range for shoulder_rot_reserve (0.02 to 1)

CMC::computeControls WARNING- small force range for elbow_flexion_reserve (0.02 to 1)

CMC::computeControls WARNING- small force range for pro_sup_reserve (0.02 to 1)

CMC::computeControls WARNING- small force range for deviation_reserve (0.02 to 1)

CMC::computeControls WARNING- small force range for flexion_reserve (0.02 to 1)

SimTK Exception thrown at InteriorPointOptimizer.cpp:261:
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 = 5.
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.
I can't understand what I am doing wrong...
Can someone help me?
Thank you very much!
Anna