Casadi Related Error

[UM-A]

Hi, I was looking to find something similar to casadi_kin_dyn to find symbolic equations from urdf. I managed to set it up but for some reason I get the following error:

RuntimeError Traceback (most recent call last)
/tmp/ipykernel_61422/130723631.py in
----> 1 id_str = kindyn.centerOfMass()
2 #fk = Function.deserialize(fk_str)
3 #print(fk)

~/anaconda3/envs/mpc/lib/python3.7/site-packages/casadi/casadi.py in deserialize(*args)
13513
13514 """

13515 return _casadi.Function_deserialize(*args)
13516
13517 deserialize = staticmethod(deserialize)

RuntimeError: .../casadi/core/function.cpp:1084: Not implemented

Looking forward to your response.