RuntimeError: Event loop is closed in v0.21

[yunguangli]

Description
Under Flet 0.21.1, I tested the ResponsiveRow example in the documentation. There as not problem when the program was running. The problem was at when I closed the program. There were a lot of error messages in the console. This doesn't happen in Flet 0.20.2 and prior.

Code example to reproduce the issue:

Use the ResponsiveRow example in the documentation

Describe the results you received:
There are error messages when I closed the program.

Exception ignored in: <function StreamWriter.del at 0x000001DE7C9744A0>
Traceback (most recent call last):
File "C:\AppData\Local\Programs\Python\Python312\Lib\asyncio\streams.py", line 397, in del
self.close()
File "C:\AppData\Local\Programs\Python\Python312\Lib\asyncio\streams.py", line 343, in close
return self._transport.close()
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\AppData\Local\Programs\Python\Python312\Lib\asyncio\proactor_events.py", line 109, in close
self._loop.call_soon(self._call_connection_lost, None)
File "C:\AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 772, in call_soon
self._check_closed()
File "C:\AppData\Local\Programs\Python\Python312\Lib\asyncio\base_events.py", line 519, in _check_closed
raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed

Describe the results you expected:

Additional information you deem important (e.g. issue happens only occasionally):

Flet version (pip show flet):
0.21.1

(paste your output here)

Give your requirements.txt file (don't pip freeze, instead give direct packages):

(The requirements)

Operating system:
Windows 11
Python 3.12.0

Additional environment details:

[ndonkoHenri]

Did you happen to resolve this?

[yunguangli]

No. I haven't resolve this. This only happens in my company Windows PC , which is more restricted with network security , etc. It doesn't happen in my home laptop. And only happened in Flet 0.21 and above. 0.20.2 below has no problem in my company pc. So I want to investigate more before I repost the issue again.

[ndonkoHenri]

As reference, here is the issue: python/cpython#109538
As mentioned by Guido here, the issue has already been fixed,and only the latest python versions should have this fix.
Here is the list of python releases: https://www.python.org/downloads/
I suggest you get one released from 2024 - at the time I am writing either 3.11.8 or 3.12.2.

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