Feedback linearization for a two link planar manipulator in simscape

Hello, I'm trying to implement feedback linearization for a two link planar manipulator in simscape. I calculated the necessary torque to apply for the two joints using the RNE block, but it doesn't works. I have this messagge erros : n = 2 An error occurred while running the simulation and the simulation was terminated Caused by: Error in 'simscape_link_3/RNE/MATLAB Fcn'. Evaluation of expression resulted in an invalid output. Only finite double vector or matrix outputs are supported

[Suhan]

Could you share your model here so that we can reproduce the issue? Looks like the return value of MATLAB Function block is not supported by the subsequent block