MultiDatastream errors

[securedimensions]

get_dao()

TypeError: MultiDatastream.get_dao() takes 1 positional argument but 2 were given

eq()

AttributeError: 'MultiDatastream' object has no attribute 'observation_area'. Did you mean: 'observation_type'?

eq() returns false instead of true

...
mds = fsc.MultiDatastream(name='Air Temperature and Humidity',
                                      description='Air temperature and humidity measured with the FT-0310 Weather Station',
                                      properties={},
                                      unit_of_measurements=[celsius, percentage],
                                      observation_type='http://www.opengis.net/def/observationType/OGC-OM/2.0/OM_ComplexObservation',
                                      multi_observation_data_types=['http://www.opengis.net/def/observationType/OGC-OM/2.0/OM_Measurement',
                                               'http://www.opengis.net/def/observationType/OGC-OM/2.0/OM_Measurement'],
                                      observed_properties=[temp, humidity],
                                      thing=thing,
                                      sensor=sensor)
service.create(mds)
entities = thing.get_multi_datastreams().query().list().entities
if mds != entities[0]:
    print("multi_datastreams are not equal")
else:
    print("multi_datastreams are equal")

[reraroru]

1. where does the error message come from?
2. source code typing error
3. error in source code: in MultiDatastream.setstate the UnitOfMeasurement needs to be instantiated with class UnitOfMeasurement