TypeError: cache_key() missing 1 required positional argument: 'model_metadata'

Hi, I try to train Rasa NLU from python and I get this error:

TypeError: cache_key() missing 1 required positional argument: ‘model_metadata’

when I run : “trainer = Trainer(config.load(“config.yml”))”

Could you elaborate on the steps that you took and what you expected to happen? Preferably with all the relevant code?