TypeError: Parameter to MergeFrom() must be instance of same class

[odegnome]

I am getting an error when I execute the example provided in README:

TypeError: Parameter to MergeFrom() must be instance of same class: expected cosmos.base.v1beta1.coin_pb2.Coin got cosmos.base.v1beta1.coin_pb2.Coin.

Dependencies:

name	version
python	3.8.9
pyband	0.2.8
protobuf	4.21.5

I experimented with protobuf==3.20.1 and also with protobuf==4.21.5.

What am I doing wrong?