NNPC error - S-function block 'untitled/NN Predictive Controller/S-Function' references obsolete level-1 MATLAB S-function 'predopt'.

Hello

I am working with NNPC block in Simulink with my plant model designed as a physical model of Ohmic heater using the Simscape library. The inputs to the NNPC for 'Plant Identification' step is Voltage (input) and Temperature (output). After the training of the NN, I enter the necessary values for the controller. The controller block gives me this error:

"Warning:S-function block 'untitled/NN Predictive Controller/S-Function' references obsolete level-1 MATLAB S-function 'predopt'. Manually review the code and convert to level-2 MATLAB S-function if necessary. For more information, see Convert Level-1 MATLAB S-Functions to Level-2."

Can anyone please help me how to remove this error. Any insights on this issue will be highly appreciated.

Thanking in anticipation.