Errors after switching to neuronunit & sciunit master

[zsinnema]

Atm we use the metacell branch of sciunit and neuronunit. When I switch to the master branch and I try to create a new model I get errors. In the past I tested with the InputResistanceTest of neuronunit.passive

Here are the errors:

0: "Can't instantiate class, reason candidates: {'observation': ['none or more than one rule validate', {'oneof definition 0': [{'n': ['must be of integer type']}], 'oneof definition 1': [{'n': ['must be of integer type'], 'sem': ['required field'], 'std': ['unknown field']}]}]}"

any thoughts about this, help is very welcome