Error using tall/cellfun

I'm getting an error error "using tall/cellfun" while doing a project listed in mathworks "Denoise Speech Using Deep Learning Networks". I don't know how to fix this error pr why this error occured in the first place. Seeking explanation for this particuar error. If you know anuthing about it then please consider helping me below this post.

Project link

[Walter Roberson]

Messages of the form "such and such a file is used in This Place" are usually indicating that MATLAB cannot find the indicated function installed anywhere, but that MATLAB knows that the function is part of the indicated package.

You might need to use addAttachedFiles to add the directory containing the function to the pool.