ValueError                                Traceback (most recent call last)
<ipython-input-3-017a44a94d83> in <module>
----> 1 df = gbq.read_gbq('SELECT * FROM `cmg-consumer-analytics.122142903.ga_sessions_20210314` LIMIT 10', project_id='cmg-consumer-analytics')

~/anaconda3/envs/python3/lib/python3.6/site-packages/pandas/io/gbq.py in read_gbq(query, project_id, index_col, col_order, reauth, auth_local_webserver, dialect, location, configuration, credentials, use_bqstorage_api, private_key, verbose, progress_bar_type)
    161     DataFrame.to_gbq : Write a DataFrame to Google BigQuery.
    162     """
--> 163     pandas_gbq = _try_import()
    164 
    165     kwargs: Dict[str, Union[str, bool]] = {}

~/anaconda3/envs/python3/lib/python3.6/site-packages/pandas/io/gbq.py in _try_import()
     15         "See the docs: https://pandas-gbq.readthedocs.io."
     16     )
---> 17     pandas_gbq = import_optional_dependency("pandas_gbq", extra=msg)
     18     return pandas_gbq
     19 

~/anaconda3/envs/python3/lib/python3.6/site-packages/pandas/compat/_optional.py in import_optional_dependency(name, extra, raise_on_missing, on_version)
     87     )
     88     try:
---> 89         module = importlib.import_module(name)
     90     except ImportError:
     91         if raise_on_missing:

~/anaconda3/envs/python3/lib/python3.6/importlib/__init__.py in import_module(name, package)
    124                 break
    125             level += 1
--> 126     return _bootstrap._gcd_import(name[level:], package, level)
    127 
    128 

~/anaconda3/envs/python3/lib/python3.6/importlib/_bootstrap.py in _gcd_import(name, package, level)

~/anaconda3/envs/python3/lib/python3.6/importlib/_bootstrap.py in _find_and_load(name, import_)

~/anaconda3/envs/python3/lib/python3.6/importlib/_bootstrap.py in _find_and_load_unlocked(name, import_)

~/anaconda3/envs/python3/lib/python3.6/importlib/_bootstrap.py in _load_unlocked(spec)

~/anaconda3/envs/python3/lib/python3.6/importlib/_bootstrap_external.py in exec_module(self, module)

~/anaconda3/envs/python3/lib/python3.6/importlib/_bootstrap.py in _call_with_frames_removed(f, *args, **kwds)

~/anaconda3/envs/python3/lib/python3.6/site-packages/pandas_gbq/__init__.py in <module>
----> 1 from .gbq import to_gbq, read_gbq, Context, context  # noqa
      2 
      3 from ._version import get_versions
      4 
      5 versions = get_versions()

~/anaconda3/envs/python3/lib/python3.6/site-packages/pandas_gbq/gbq.py in <module>
     10 try:
     11     from google.api_core import exceptions as google_exceptions
---> 12     from google.cloud import bigquery
     13 except ImportError:  # pragma: NO COVER
     14     bigquery = None

~/anaconda3/envs/python3/lib/python3.6/site-packages/google/cloud/bigquery/__init__.py in <module>
     33 __version__ = bigquery_version.__version__
     34 
---> 35 from google.cloud.bigquery.client import Client
     36 from google.cloud.bigquery.dataset import AccessEntry
     37 from google.cloud.bigquery.dataset import Dataset

~/anaconda3/envs/python3/lib/python3.6/site-packages/google/cloud/bigquery/client.py in <module>
     54 from google.cloud.bigquery._helpers import _verify_job_config_type
     55 from google.cloud.bigquery._http import Connection
---> 56 from google.cloud.bigquery import _pandas_helpers
     57 from google.cloud.bigquery.dataset import Dataset
     58 from google.cloud.bigquery.dataset import DatasetListItem

~/anaconda3/envs/python3/lib/python3.6/site-packages/google/cloud/bigquery/_pandas_helpers.py in <module>
     34     pyarrow = None
     35 
---> 36 from google.cloud.bigquery import schema
     37 
     38 

~/anaconda3/envs/python3/lib/python3.6/site-packages/google/cloud/bigquery/schema.py in <module>
     17 import collections
     18 
---> 19 from google.cloud.bigquery_v2 import types
     20 
     21 

~/anaconda3/envs/python3/lib/python3.6/site-packages/google/cloud/bigquery_v2/__init__.py in <module>
     17 
     18 
---> 19 from .types.encryption_config import EncryptionConfiguration
     20 from .types.model import DeleteModelRequest
     21 from .types.model import GetModelRequest

~/anaconda3/envs/python3/lib/python3.6/site-packages/google/cloud/bigquery_v2/types/__init__.py in <module>
     16 #
     17 
---> 18 from .encryption_config import EncryptionConfiguration
     19 from .model import (
     20     DeleteModelRequest,

~/anaconda3/envs/python3/lib/python3.6/site-packages/google/cloud/bigquery_v2/types/encryption_config.py in <module>
     27 
     28 
---> 29 class EncryptionConfiguration(proto.Message):
     30     r"""
     31 

~/anaconda3/envs/python3/lib/python3.6/site-packages/proto/message.py in __new__(mcls, name, bases, attrs)
    212         desc = descriptor_pb2.DescriptorProto(
    213             name=name,
--> 214             field=[i.descriptor for i in fields],
    215             oneof_decl=[
    216                 descriptor_pb2.OneofDescriptorProto(name=i) for i in oneofs.keys()

~/anaconda3/envs/python3/lib/python3.6/site-packages/proto/message.py in <listcomp>(.0)
    212         desc = descriptor_pb2.DescriptorProto(
    213             name=name,
--> 214             field=[i.descriptor for i in fields],
    215             oneof_decl=[
    216                 descriptor_pb2.OneofDescriptorProto(name=i) for i in oneofs.keys()

~/anaconda3/envs/python3/lib/python3.6/site-packages/proto/fields.py in descriptor(self)
    109                 type_name=type_name,
    110                 json_name=self.json_name,
--> 111                 proto3_optional=self.optional,
    112             )
    113 

ValueError: Protocol message FieldDescriptorProto has no "proto3_optional" field.```



Why does the error still prevail? am I missing something else? Feedback appreciated.

_Originally posted by @Tsakunelson in https://github.com/googleapis/python-bigquery/issues/305#issuecomment-801102273_