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In Orange3 while only using its widgets, without writing Python code, I’ve implemented the following typical machine learning processes

  1. Train a training set, (1 file)
  2. Validating a validation set (e.g. using Naiive Bayes and kNN), and
  3. Testing the model with a test set.(another file)

I keep getting:

test and train datasets have different target variables

error message. This is despite using exact same formats and names (with different values of course). What did I do wrong?

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    $\begingroup$ Can you please provide the workflow screenshot? If I understand right your data are in two separate files (one for training and other for testing)? $\endgroup$ – Primoz Jul 2 '18 at 10:29

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