I get the following error when I have googleapis-common-protos version >= 1.56.1 installed along with protobuf package version <= 3.18.1:

from google.rpc import error_details_pb2
Traceback (most recent call last):
File "", line 1, in
File "C:\Users\manow\miniconda3\envs\py37_gAPIs_test\lib\site-packages\google\rpc\error_details_pb2.py", line 39, in
_RETRYINFO = DESCRIPTOR.message_types_by_name["RetryInfo"]
AttributeError: 'NoneType' object has no attribute 'message_types_by_name'

I'm using Windows 10, and I've reproduced the problem with python 3.7 and 3.8.