Error in the example: Train A Semantic Segmentation Network

I wanted to run this example:

Train A Semantic Segmentation Network

https://it.mathworks.com/help/vision/ref/pixellabelimagedatastore.html#d117e46403

So i copy-pasted on matlab the string

openExample('vision/TrainSemanticSegmentationNetworkExample'

On the execution, at the line 13, I am getting the error "Error using uint8. Conversion to uint8 from cell is not possible.".

The istruction that causes the error is "L = imresize(uint8(C),5);".

I tried to run the example also in matlab online and I'm getting the same error.

Anyone had the same problem? How is it possible that i get the same error also in matlab online with an example written by mathworks?

Attached in PDF the execution of the live script.

[Walter Roberson]

It appears to me that the line should be

L = imresize(uint8(C{1}),5);

[Walter Roberson]

I have reported this problem to Mathworks.