matlab tutorial shows error

options = trainingOptions('sgdm',...
    'MiniBatchSize',10,...
    'MaxEpochs',4,...
    'InitialLearnRate',1e-4,...
    'Verbose',false,...
    'Plots','training-progress',...
    'ValidationData',validationImages,...
    'ValidationFrequency',5);

Showing error in options 'plots' 'validationData'

[Walter Roberson]

That appears to be extracted from https://www.mathworks.com/help/nnet/examples/transfer-learning-using-alexnet.html

When I run the code in R2017b I do not see any error message.

validationImages is a variable that is defined near the top of that example.