Can't pickle BulkWriteError

import pickle

import pymongo

db = pymongo.MongoClient().demo

db.drop_collection("demo")

db.create_collection("demo", validator={"$jsonSchema": {"required": ["foo"]}})

try:

    db.demo.insert_many([{"bar": 1}])

except Exception as e:

    exc = e

exc

pymongo.errors.BulkWriteError("batch op errors occurred, full error: {'writeErrors': [{'index': 0, 'code': 121, 'errmsg': 'Document failed validation', 'op': {'bar': 1, '_id': ObjectId('5fa2c64c60c6844f5fef6964')}}], 'writeConcernErrors': [], 'nInserted': 0, 'nUpserted': 0, 'nMatched': 0, 'nModified': 0, 'nRemoved': 0, 'upserted': []}")

pickle.loads(pickle.dumps(exc))

---------------------------------------------------------------------------

AttributeError                            Traceback (most recent call last)

<ipython-input-27-3ba4d0d7966c> in <module>

----> 1 pickle.loads(pickle.dumps(exc))

~/miniconda3/envs/demo/lib/python3.8/site-packages/tblib/pickling_support.py in unpickle_exception(func, args, cause, tb)

     24 

     25 def unpickle_exception(func, args, cause, tb):

---> 26     inst = func(*args)

     27     inst.__cause__ = cause

     28     inst.__traceback__ = tb

~/miniconda3/envs/demo/lib/python3.8/site-packages/pymongo/errors.py in __init__(self, results)

    239     """

    240     def __init__(self, results):

--> 241         super(BulkWriteError, self).__init__(

    242             "batch op errors occurred", 65, results)

    243 

~/miniconda3/envs/demo/lib/python3.8/site-packages/pymongo/errors.py in __init__(self, error, code, details, max_wire_version)

    155         error_labels = None

    156         if details is not None:

--> 157             error_labels = details.get('errorLabels')

    158         super(OperationFailure, self).__init__(

    159             _format_detailed_error(error, details), error_labels=error_labels)

AttributeError: 'str' object has no attribute 'get'