ImportError: cannot import name 'AsyncCallbackManager' from 'langchain.callbacks.base' (/usr/local/lib/python3.9/dist-

[chaser24]

Traceback (most recent call last):
File "/usr/lib/python3.9/multiprocessing/process.py", line 315, in _bootstrap
self.run()
File "/usr/lib/python3.9/multiprocessing/process.py", line 108, in run
self._target(*self._args, **self._kwargs)
File "/usr/local/lib/python3.9/dist-packages/uvicorn/_subprocess.py", line 76, in subprocess_started
target(sockets=sockets)
File "/usr/local/lib/python3.9/dist-packages/uvicorn/server.py", line 61, in run
return asyncio.run(self.serve(sockets=sockets))
File "/usr/lib/python3.9/asyncio/runners.py", line 44, in run
return loop.run_until_complete(main)
File "/usr/lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
return future.result()
File "/usr/local/lib/python3.9/dist-packages/uvicorn/server.py", line 68, in serve
config.load()
File "/usr/local/lib/python3.9/dist-packages/uvicorn/config.py", line 473, in load
self.loaded_app = import_from_string(self.app)
File "/usr/local/lib/python3.9/dist-packages/uvicorn/importer.py", line 24, in import_from_string
raise exc from None
File "/usr/local/lib/python3.9/dist-packages/uvicorn/importer.py", line 21, in import_from_string
module = importlib.import_module(module_str)
File "/usr/lib/python3.9/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1030, in _gcd_import
File "", line 1007, in _find_and_load
File "", line 986, in _find_and_load_unlocked
File "", line 680, in _load_unlocked
File "", line 790, in exec_module
File "", line 228, in _call_with_frames_removed
File "/home/chaseryang/langchain/chat-langchain/main.py", line 12, in
from query_data import get_chain
File "/home/chaseryang/langchain/chat-langchain/query_data.py", line 2, in
from langchain.callbacks.base import AsyncCallbackManager
ImportError: cannot import name 'AsyncCallbackManager' from 'langchain.callbacks.base' (/usr/local/lib/python3.9/dist-packages/langchain/callbacks/base.py)

[yudexiaozhou]

use from langchain.callbacks.manager import AsyncCallbackManager

[gabrielspadon]

@yudexiaozhou Works!

[doron-kahana]

Is there an open PR for this issue?

[r0mdau]

I opened a PR to solve this issue #91

[DylanMay]

use from langchain.callbacks.manager import AsyncCallbackManager

it works