win system add_reader NOT supported

[bingoHome]

Describe the bug

URL: http://127.0.0.1:2718?access_token=7JWPLj-cJuXMWMdkSHP11g

ERROR: Exception in ASGI application
Traceback (most recent call last):
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\uvicorn\protocols\websockets\websockets_impl.py", line 244, in run_asgi
result = await self.app(self.scope, self.asgi_receive, self.asgi_send) # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\uvicorn\middleware\proxy_headers.py", line 60, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\applications.py", line 113, in call
await self.middleware_stack(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\errors.py", line 151, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\auth.py", line 219, in call
return await super().call(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\sessions.py", line 85, in call
await self.app(scope, receive, send_wrapper)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\base.py", line 103, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\auth.py", line 250, in call
await super().call(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\authentication.py", line 48, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\auth.py", line 239, in wrapped_app
await app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\cors.py", line 77, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 97, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[Previous line repeated 1 more time]
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\exceptions.py", line 63, in call
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 53, in wrapped_app
raise exc
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 736, in app
await route.handle(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 462, in handle
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 736, in app
await route.handle(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 364, in handle
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 97, in app
await wrap_app_handling_exceptions(app, session)(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 53, in wrapped_app
raise exc
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 95, in app
await func(session)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\endpoints\ws.py", line 108, in websocket_endpoint
await WebsocketHandler(
...<8 lines>...
).start()
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\endpoints\ws.py", line 617, in start
get_session()
~~~~~~~~~~~^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\endpoints\ws.py", line 594, in get_session
new_session = mgr.create_session(
query_params=query_params.to_dict(),
...<2 lines>...
file_key=self.file_key,
)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\sessions.py", line 861, in create_session
session = Session.create(
initialization_id=file_key,
...<13 lines>...
ttl_seconds=self.ttl_seconds,
)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\sessions.py", line 473, in create
return cls(
initialization_id=initialization_id,
...<5 lines>...
ttl_seconds=ttl_seconds,
)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\sessions.py", line 528, in init
self.message_distributor.start()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_utils\distributor.py", line 76, in start
asyncio.get_event_loop().add_reader(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
self.input_connection.fileno(), self._on_change
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "C:\Users\DELL\AppData\Roaming\uv\python\cpython-3.13.7-windows-x86_64-none\Lib\asyncio\events.py", line 552, in add_reader
raise NotImplementedError
NotImplementedError
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\uvicorn\protocols\websockets\websockets_impl.py", line 244, in run_asgi
result = await self.app(self.scope, self.asgi_receive, self.asgi_send) # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\uvicorn\middleware\proxy_headers.py", line 60, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\applications.py", line 113, in call
await self.middleware_stack(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\errors.py", line 151, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\auth.py", line 219, in call
return await super().call(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\sessions.py", line 85, in call
await self.app(scope, receive, send_wrapper)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\base.py", line 103, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\auth.py", line 250, in call
await super().call(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\authentication.py", line 48, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\auth.py", line 239, in wrapped_app
await app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\cors.py", line 77, in call
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 97, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\middleware.py", line 361, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[Previous line repeated 1 more time]
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\middleware\exceptions.py", line 63, in call
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 53, in wrapped_app
raise exc
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 736, in app
await route.handle(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 462, in handle
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 716, in call
await self.middleware_stack(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 736, in app
await route.handle(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 364, in handle
await self.app(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 97, in app
await wrap_app_handling_exceptions(app, session)(scope, receive, send)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 53, in wrapped_app
raise exc
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\starlette\routing.py", line 95, in app
await func(session)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\endpoints\ws.py", line 108, in websocket_endpoint
await WebsocketHandler(
...<8 lines>...
).start()
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\endpoints\ws.py", line 617, in start
get_session()
~~~~~~~~~~~^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\api\endpoints\ws.py", line 594, in get_session
new_session = mgr.create_session(
query_params=query_params.to_dict(),
...<2 lines>...
file_key=self.file_key,
)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\sessions.py", line 861, in create_session
session = Session.create(
initialization_id=file_key,
...<13 lines>...
ttl_seconds=self.ttl_seconds,
)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\sessions.py", line 473, in create
return cls(
initialization_id=initialization_id,
...<5 lines>...
ttl_seconds=ttl_seconds,
)
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_server\sessions.py", line 528, in init
self.message_distributor.start()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "C:\Users\DELL\Desktop\mo\uv_mo\Ex4.venv\Lib\site-packages\marimo_utils\distributor.py", line 76, in start
asyncio.get_event_loop().add_reader(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
self.input_connection.fileno(), self._on_change
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "C:\Users\DELL\AppData\Roaming\uv\python\cpython-3.13.7-windows-x86_64-none\Lib\asyncio\events.py", line 552, in add_reader
raise NotImplementedError
NotImplementedError

Will you submit a PR?

• Yes

Environment

Windows + Python 3.13.7

Code to reproduce

No response

[mscolnick]

@bingoHome , can you please run marimo env

[bingoHome]

{
"marimo": "0.14.17",
"editable": false,
"OS": "Windows",
"OS Version": "10",
"Processor": "Intel64 Family 6 Model 142 Stepping 12, GenuineIntel",
"Python Version": "3.10.11",
"Binaries": {
"Browser": "140.0.7339.128",
"Node": "v18.18.0"
},
"Dependencies": {
"click": "8.3.0",
"docutils": "0.21.2",
"itsdangerous": "2.2.0",
"jedi": "0.19.2",
"markdown": "3.9",
"narwhals": "2.5.0",
"packaging": "25.0",
"psutil": "7.1.0",
"pygments": "2.19.2",
"pymdown-extensions": "10.16.1",
"pyyaml": "6.0.2",
"starlette": "0.48.0",
"tomlkit": "0.13.2",
"typing-extensions": "4.12.2",
"uvicorn": "0.36.0",
"websockets": "13.0.1"
},
"Optional Dependencies": {},
"Experimental Flags": {}
}

[mscolnick]

can you upgrade marimo / re-install the latest marimo or downgrade uvicorn to 0.36.0. for some reason, marimo is no longer compatible with uvicorn==0.36.0. This was pinned in #6467

[bingoHome]

Great! It works smoothly in the following environment.
{
"marimo": "0.16.1",
"editable": false,
"location": "C:/Users/DELL/Desktop/mo/uv_mo/Ex4/.venv/Lib/site-packages/marimo",
"OS": "Windows",
"OS Version": "10",
"Processor": "Intel64 Family 6 Model 142 Stepping 12, GenuineIntel",
"Python Version": "3.13.7",
"Locale": "zh_CN",
"Binaries": {
"Browser": "140.0.7339.128",
"Node": "v18.18.0"
},
"Dependencies": {
"click": "8.3.0",
"docutils": "0.22.2",
"itsdangerous": "2.2.0",
"jedi": "0.19.2",
"markdown": "3.9",
"narwhals": "2.5.0",
"packaging": "25.0",
"psutil": "7.1.0",
"pygments": "2.19.2",
"pymdown-extensions": "10.16.1",
"pyyaml": "6.0.2",
"starlette": "0.48.0",
"tomlkit": "0.13.3",
"typing-extensions": "4.15.0",
"uvicorn": "0.35.0",
"websockets": "15.0.1"
},
"Optional Dependencies": {
"openai": "1.108.1",
"polars": "1.33.1",
"loro": "1.6.0"
},
"Experimental Flags": {}
}