The example of Train Network Using Federated Learning given in MathWorks documentation is not working

I am trying to run the example of Train Network Using Federated Learning given in the MathWorks documentation ( https://in.mathworks.com/help/deeplearning/ug/train-network-using-federated-learning.html ). But I am getting the following error:

Though it showing that Undefined function 'preprocessMiniBatch' . I have included the following function of 'preprocessMiniBatch' as given in the Mathworks documentation

Everytime I run the code I am getting this error. I am unable to understand where I am making a mistake. Someone please help me in solving this problem.

[Walter Roberson]

Which MATLAB release are you using?

[debojit sharma]

@Walter Roberson Sir, I am using MATLAB 2023a

[Walter Roberson]

Duplicated by later https://www.mathworks.com/matlabcentral/answers/2063982-the-example-of-train-network-using-federated-learning-that-is-given-in-mathworks-documentation-is-no?s_tid=srchtitle