Sit to stand model openning error

[Park SangJun]

Hi
i use "Examining Muscle Forces during Sit to Stand Transfer with Full Body Model 2016" model to analysis muscle force during sit to stand movement.
To use this model, i opened .osim file of model, but there's an error message below.
So i corrected 'rotational' to 'coupled' of coordinates in this model.
but still there's an error message:
Attempting to assign an invalid SimTK::MobilizedBodyIndex In Object 'pelvis_offset' of type PhysicalOffsetFrame. Thrown at PhysicalFrame.cpp:73 in setMobilizedBodyIndex().
please help me to figure it out
thanks.