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Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:python36libthreading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:python36libthreading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:python36libsite-packagesrasa_corechannelschannel.py", line 291, in on_message_wrapper
    on_new_message(message)
  File "C:python36libsite-packagesrasa_coreagent.py", line 316, in handle_message
    return processor.handle_message(message)
  File "C:python36libsite-packagesrasa_coreprocessor.py", line 86, in handle_message
    self._predict_and_execute_next_action(message, tracker)
  File "C:python36libsite-packagesrasa_coreprocessor.py", line 305, in _predict_and_execute_next_action
    action, policy, confidence = self.predict_next_action(tracker)
  File "C:python36libsite-packagesrasa_coreprocessor.py", line 168, in predict_next_action
    probabilities, policy = self._get_next_action_probabilities(tracker)
  File "C:python36libsite-packagesrasa_coreprocessor.py", line 478, in _get_next_action_probabilities
    tracker, self.domain)
  File "C:python36libsite-packagesrasa_corepoliciesensemble.py", line 288, in probabilities_using_best_policy
    if (result.index(max_confidence) ==
AttributeError: 'NoneType' object has no attribute 'index'

PYTHON  3.6.0
RASA CORE   0.12.0
RASA NLU    0.13.0
TENSORFLOW  1.10.0
PROTOBUF    3.6.0

python -m rasa_core.train -d domain.yml -s stories.md -o models/dialogue

./models/dialogue