web_voyager.ipynb met with a "NotImplementedError" when i run the example script

[chuangzhidan]

Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain rather than my code.

Example Code

**exactly the same code in the web_voyager.ipynb

Error Message and Stack Trace (if applicable)

---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
Cell In[10], line 5
      2 from IPython import display
      3 from playwright.async_api import async_playwright
----> 5 browser = await async_playwright().start()
      7 # We will set headless=False so we can watch the agent navigate the web.
      8 browser = await browser.chromium.launch(headless=False, args=None)

File ~\AppData\Local\Programs\Python\Python39\lib\site-packages\playwright\async_api\_context_manager.py:51, in PlaywrightContextManager.start(self)
     50 async def start(self) -> AsyncPlaywright:
---> 51     return await self.__aenter__()

File ~\AppData\Local\Programs\Python\Python39\lib\site-packages\playwright\async_api\_context_manager.py:46, in PlaywrightContextManager.__aenter__(self)
     44 if not playwright_future.done():
     45     playwright_future.cancel()
---> 46 playwright = AsyncPlaywright(next(iter(done)).result())
     47 playwright.stop = self.__aexit__  # type: ignore
     48 return playwright

File ~\AppData\Local\Programs\Python\Python39\lib\site-packages\playwright\_impl\_connection.py:272, in Connection.run(self)
    269 async def init() -> None:
    270     self.playwright_future.set_result(await self._root_object.initialize())
--> 272 await self._transport.connect()
    273 self._init_task = self._loop.create_task(init())
    274 await self._transport.run()

File ~\AppData\Local\Programs\Python\Python39\lib\site-packages\playwright\_impl\_transport.py:133, in PipeTransport.connect(self)
    131 except Exception as exc:
    132     self.on_error_future.set_exception(exc)
--> 133     raise exc
    135 self._output = self._proc.stdin

File ~\AppData\Local\Programs\Python\Python39\lib\site-packages\playwright\_impl\_transport.py:120, in PipeTransport.connect(self)
    117         startupinfo.wShowWindow = subprocess.SW_HIDE
    119     executable_path, entrypoint_path = compute_driver_executable()
--> 120     self._proc = await asyncio.create_subprocess_exec(
    121         executable_path,
    122         entrypoint_path,
    123         "run-driver",
    124         stdin=asyncio.subprocess.PIPE,
    125         stdout=asyncio.subprocess.PIPE,
    126         stderr=_get_stderr_fileno(),
    127         limit=32768,
    128         env=env,
    129         startupinfo=startupinfo,
    130     )
    131 except Exception as exc:
    132     self.on_error_future.set_exception(exc)

File ~\AppData\Local\Programs\Python\Python39\lib\asyncio\subprocess.py:236, in create_subprocess_exec(program, stdin, stdout, stderr, loop, limit, *args, **kwds)
    229     warnings.warn("The loop argument is deprecated since Python 3.8 "
    230                   "and scheduled for removal in Python 3.10.",
    231                   DeprecationWarning,
    232                   stacklevel=2
    233     )
    234 protocol_factory = lambda: SubprocessStreamProtocol(limit=limit,
    235                                                     loop=loop)
--> 236 transport, protocol = await loop.subprocess_exec(
    237     protocol_factory,
    238     program, *args,
    239     stdin=stdin, stdout=stdout,
    240     stderr=stderr, **kwds)
    241 return Process(transport, protocol, loop)

File ~\AppData\Local\Programs\Python\Python39\lib\asyncio\base_events.py:1676, in BaseEventLoop.subprocess_exec(self, protocol_factory, program, stdin, stdout, stderr, universal_newlines, shell, bufsize, encoding, errors, text, *args, **kwargs)
   1674     debug_log = f'execute program {program!r}'
   1675     self._log_subprocess(debug_log, stdin, stdout, stderr)
-> 1676 transport = await self._make_subprocess_transport(
   1677     protocol, popen_args, False, stdin, stdout, stderr,
   1678     bufsize, **kwargs)
   1679 if self._debug and debug_log is not None:
   1680     logger.info('%s: %r', debug_log, transport)

File ~\AppData\Local\Programs\Python\Python39\lib\asyncio\base_events.py:498, in BaseEventLoop._make_subprocess_transport(self, protocol, args, shell, stdin, stdout, stderr, bufsize, extra, **kwargs)
    494 async def _make_subprocess_transport(self, protocol, args, shell,
    495                                      stdin, stdout, stderr, bufsize,
    496                                      extra=None, **kwargs):
    497     """Create subprocess transport."""
--> 498     raise NotImplementedError

NotImplementedError: 

Description

i restarted the kernel to use updated packages. search the internet, did not find a solution

playwright Version: 1.43.0
Summary: A high-level API to automate web browsers
Home-page: https://github.com/Microsoft/playwright-python
Author: Microsoft Corporation
Author-email:
License: Apache-2.0
Location: c:\users\gavin\appdata\local\programs\python**\python39**lib\site-packages
Requires: greenlet, pyee
Required-by:

System Info

langchain==0.1.17
langchain-community==0.0.37
langchain-core==0.1.52
langchain-openai==0.1.1
langchain-text-splitters==0.0.1
langchainhub==0.1.15
langgraph==0.0.45
langsmith==0.1.54

[hinthornw]

This is a playwright issue so I"m going to move this to discussions. THere are other threads related to playwright and asyncio breaks on windows, e.g.: microsoft/playwright-python#723