Hi,

I am getting the following error when I am trying to test the automatic client-side encryption.  I don't find any documentation or reference to resolve this issue.

Note: I am using local key encryption.

2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] MongoCryptD starting : pid=27930 port=27020 socketFile=/tmp/mongocryptd.sock 64-bit host=mani-Lenovo-Z50-70
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] db version v4.2.0
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] git version: a4b751dcf51dd249c5865812b390cfd1c0129c30
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.1.1 11 Sep 2018
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] allocator: tcmalloc
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] modules: enterprise
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] build environment:
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] distmod: ubuntu1804
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] distarch: x86_64
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] target_arch: x86_64
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] options: { processManagement: { idleShutdownTimeoutSecs: 60 } }
2019-08-24T18:39:29.820-0700 I CONTROL [initandlisten] Using lock file: /home/mani/MongoCSE/mongocryptd.pid
2019-08-24T18:39:29.919-0700 I NETWORK [initandlisten] Listening on /tmp/mongocryptd.sock
2019-08-24T18:39:29.919-0700 I NETWORK [initandlisten] Listening on 127.0.0.1
2019-08-24T18:39:29.920-0700 I NETWORK [initandlisten] waiting for connections on port 27020
2019-08-24T18:39:30.286-0700 I NETWORK [listener] connection accepted from 127.0.0.1:51932 #1 (1 connection now open)
2019-08-24T18:39:30.288-0700 I NETWORK [listener] connection accepted from 127.0.0.1:51934 #2 (2 connections now open)
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/pymongo/encryption.py", line 77, in _wrap_encryption_errors
yield
File "/usr/local/lib/python3.7/dist-packages/pymongo/encryption.py", line 280, in encrypt
encrypted_cmd = self._auto_encrypter.encrypt(database, encoded_cmd)
File "/usr/local/lib/python3.7/dist-packages/pymongocrypt/auto_encrypter.py", line 44, in encrypt
return run_state_machine(ctx, self.callback)
File "/usr/local/lib/python3.7/dist-packages/pymongocrypt/state_machine.py", line 139, in run_state_machine
result = callback.mark_command(ctx.database, mongocryptd_cmd)
File "/usr/local/lib/python3.7/dist-packages/pymongo/encryption.py", line 173, in mark_command
codec_options=DEFAULT_RAW_BSON_OPTIONS)
File "/usr/local/lib/python3.7/dist-packages/pymongo/database.py", line 733, in command
codec_options, session=session, **kwargs)
File "/usr/local/lib/python3.7/dist-packages/pymongo/database.py", line 630, in _command
client=self.__client)
File "/usr/local/lib/python3.7/dist-packages/pymongo/pool.py", line 613, in command
user_fields=user_fields)
File "/usr/local/lib/python3.7/dist-packages/pymongo/network.py", line 167, in command
parse_write_concern_error=parse_write_concern_error)
File "/usr/local/lib/python3.7/dist-packages/pymongo/helpers.py", line 159, in _check_command_response
raise OperationFailure(msg % errmsg, code, response)
pymongo.errors.OperationFailure: Unknown type name alias: String

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "ClientSideEncryption.py", line 52, in <module>
post_id = collection.insert_one(user)
File "/usr/local/lib/python3.7/dist-packages/pymongo/collection.py", line 698, in insert_one
session=session),
File "/usr/local/lib/python3.7/dist-packages/pymongo/collection.py", line 612, in _insert
bypass_doc_val, session)
File "/usr/local/lib/python3.7/dist-packages/pymongo/collection.py", line 600, in _insert_one
acknowledged, _insert_command, session)
File "/usr/local/lib/python3.7/dist-packages/pymongo/mongo_client.py", line 1492, in _retryable_write
return self._retry_with_session(retryable, func, s, None)
File "/usr/local/lib/python3.7/dist-packages/pymongo/mongo_client.py", line 1385, in _retry_with_session
return func(session, sock_info, retryable)
File "/usr/local/lib/python3.7/dist-packages/pymongo/collection.py", line 595, in _insert_command
retryable_write=retryable_write)
File "/usr/local/lib/python3.7/dist-packages/pymongo/pool.py", line 618, in command
self._raise_connection_failure(error)
File "/usr/local/lib/python3.7/dist-packages/pymongo/pool.py", line 613, in command
user_fields=user_fields)
File "/usr/local/lib/python3.7/dist-packages/pymongo/network.py", line 121, in command
dbname, spec, check_keys, codec_options)
File "/usr/local/lib/python3.7/dist-packages/pymongo/encryption.py", line 286, in encrypt
return encrypt_cmd
File "/usr/lib/python3.7/contextlib.py", line 130, in _exit_
self.gen.throw(type, value, traceback)
File "/usr/local/lib/python3.7/dist-packages/pymongo/encryption.py", line 83, in _wrap_encryption_errors
raise EncryptionError(exc)
pymongo.errors.EncryptionError: Unknown type name alias: String
2019-08-24T18:39:30.815-0700 I NETWORK [conn2] end connection 127.0.0.1:51934 (1 connection now open)
2019-08-24T18:39:30.815-0700 I NETWORK [conn1] end connection 127.0.0.1:51932 (0 connections now open)