3D invreion for 3D Electromagnetics problem

Do we have 3D inversion code for 3D Electromagnetics problem currently ? I try to modify the sample code in tutorial to progress a 3D inversion problem of frequency domian. When I run the code , I encountered the problem like this: “AttributeError: Simulation does not have a getJ attribute.Cannot form the sensitivity explicitly” . Does this mean that currently, for three-dimensional electromagnetic inversion, the simulation class cannot calculate the corresponding Jacobian matrix?