Hi,
After updating rasa to version 0.23.0, I get the following error when I train a new model:
Training Core model ...
Core model training completed.
Training NLU model ...
2019-11-28 12:43:28 ERROR rasax.community.api.blueprints.models - 500, Internal Server Error, body = 'b' {"version": "1.5.0", "status": "failure" , "message": "An unexpected error occurred during training. Error: argument of type \ 'NoneType \' is not iterable", "reason": "TrainingError", "details": {}, "help": null, " code ": 500} ''
Training Core model...
Core model training completed.
Training NLU model...
2019-12-03 16:18:10 ERROR rasax.community.api.blueprints.models - 500, Internal Server Error, body='b'{"version":"1.5.1","status":"failure","message":"An unexpected error occurred during training. Error: argument of type \'NoneType\' is not iterable","reason":"TrainingError","details":{},"help":null,"code":500}''