Muscle recruitment solver problem

my name is hmg and I am new at AnyBody. To calculate the driver‘s force, I try to make an “Driver Model” based on the “SeatedModel”. But if I let the “InverseDynamics” run I get this Error:
[COLOR=blue]ERROR(OBJ.MCH.MUS4) : D:/w…t/AMS/A…t/A…0/A…n/E…s/0…5/Driver.main.any : Study.InverseDynamics : Muscle recruitment solver : solver aborted due to singular KKT matrix
Can anyone tell me what this ERROR means and how to eliminate it?
I am using AMS 4.0 .
Best regards


This is the self-supported forum where you can’t expect our official support.
And I would like to kindly ask you not to make several posts at the same time.

Best regards,