error when generating protected model with code generation

The code interface packaging option 'C++ class' cannot be selected for referenced model 'modelName' because it cannot combine its output and update functions. Some possible reasons for this restriction are

* The model has a continuous sample time.

* The model is saving states.

[Luca Ferro]

could you share both the commands you are using to protect the file and the error log?

Answer 1

[Jasvin]

This MATLAB Answer highlights in detail what the issue can be.

https://www.mathworks.com/matlabcentral/answers/335297-bug-simulink-will-not-autocode-build-models-with-model-referenced-integrator-blocks

It looks like the continous sample time is the source of your error.