What is "arraydatastore" error

Dear someone

I'm trying to set a multiple input and output for neural network.

In order to understand how it works, I just tried examples in Mathworks (as bellows URL) but it doesn't work.

An error message

>> dsXTrain = arraydatastore(XTrain,'IterationDimension',4);

Unrecognized function or variable 'arraydatastore'.

showed up.

URL : https://jp.mathworks.com/help/deeplearning/ug/train-network-with-multiple-outputs.html?lang=en

How can I do for this ??

---------------------Script from the URL-------------------------------

[XTrain,YTrain,anglesTrain] = digitTrain4DArrayData;

dsXTrain = datastore(XTrain,'IterationDimension',4);

dsYTrain = datastore(YTrain);

dsAnglesTrain = datastore(anglesTrain);

dsTrain = combine(dsXTrain,dsYTrain,dsAnglesTrain);

classNames = categories(YTrain);

numClasses = numel(classNames);

numObservations = numel(YTrain);

------------------------------------------------------------------------------

[chengkai zhu]

I meet the same problem. probably need update to the newest version?