Keyword Based Classifier throwing error

I am trying out MachineLearningExtractor package.
While using Keyword Based Classifier, I am getting following error.

Please help to get it resolved

It seems that you have an invalid learning JSON.
When first using the Keyword Based Classifier, you should start with an empty JSON file, something like [] (basically, just create a text file with just [] in it and make sure the file extension is .json).
Then, you can use the Keyword Based Classifier inside a Train Classifiers Scope to add to the empty JSON relevant information based on the output of the Validation Station.
More info on how to use the Keyword Based Classifier here: .