I assume you are using the current master branch to get the knowledgebasebot example but you are using Rasa 1.10.x? We are currently working on Rasa 2.0 and due to that we are changing the training data format to yaml. The example is already modified, so it uses the new training data format. Rasa 1.10.x is not able to read this kind of data format so it will not find any data. You should be able to use the example from rasa/examples/knowledgebasebot at 1.10.x · RasaHQ/rasa · GitHub.
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