AttributeError: 'NoneType' object has no attribute 'index'

@darkmanAmazigh The problem here is that u did not train your dialogue model correctly. Check this default: error: the following arguments are required: -c/--config. IN THE END I provided a solution on how to train your dialogue model manually. If you do this, instead of using the:

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

you should be able to run rasta server with or w/o NLU