Classificationlearner model doesn't run on Simulink

I wasn't able to load a trained model into Simulink.

I used the Classificationlearner app which only produces a Matlab function.

The function works well in a Matlab script but doesn't compile in a Matlab function block running in Simulink.

The compile starts but then fills GB of memory over a few minutes.

Here is the function code:

function Case_Prediction = RunANN(Predictors)
persistent ANN
Case_Prediction = 0;%Tell Simulink the size of the output
Predictors = [0,0,0,0,0,0,0,0,0,0,0];
if isempty(ANN)
    ANN = loadCompactModel('ANN.mat');%Load it only once
end
Case_Prediction = predict(ANN, Predictors);%Perform the prediction
end

In Simulink, the fucntion looks like this:

The compact structure looks like this:

What is wrong?

Thanks for your help.

Marco