error executing flower with celery in Windows 10 - celery

Question

I am developing an application in Django 3, in windows 10.
I have installed celery and RabitMQ and flower. Celery works well but when I run
celery -A proj flower
produces the following error
[I 200718 21:32:31 command:134] Visit me at http://localhost:5555
[I 200718 21:32:31 command:141] Broker: amqp://guest:**#localhost:5672//
[I 200718 21:32:31 command:142] Registered tasks:
['apps.tareas.task.send_emails_users',
'celery.accumulate',
'celery.backend_cleanup',
'celery.chain',
'celery.chord',
'celery.chord_unlock',
'celery.chunks',
'celery.group',
'celery.map',
'celery.starmap']
Traceback (most recent call last):
File "C:\Program Files\Python38\lib\runpy.py", line 193, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Program Files\Python38\lib\runpy.py", line 86, in _run_code
exec(code, run_globals)
File "C:\Users\Sofia\OneDrive\Proyectos\Django 3\shop\env\Scripts\celery.exe\__main__.py", line 9, in <module>
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\celery\__main__.py", line 16, in main
_main()
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\celery\bin\celery.py", line 322, in main
cmd.execute_from_commandline(argv)
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\celery\bin\celery.py", line 495, in execute_from_commandline
super(CeleryCommand, self).execute_from_commandline(argv)))
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\celery\bin\base.py", line 305, in execute_from_commandline
return self.handle_argv(self.prog_name, argv[1:])
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\celery\bin\celery.py", line 487, in handle_argv
return self.execute(command, argv)
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\celery\bin\celery.py", line 415, in execute
[I 200718 21:32:31 mixins:229] Connected to amqp://guest:**#127.0.0.1:5672//
return cls(
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\flower\command.py", line 51, in run_from_argv
flower.start()
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\flower\app.py", line 50, in start
self.listen(self.options.port, address=self.options.address,
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\tornado\web.py", line 2042, in listen
server.listen(port, address)
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\tornado\tcpserver.py", line 144, in listen
self.add_sockets(sockets)
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\tornado\tcpserver.py", line 157, in add_sockets
self._handlers[sock.fileno()] = add_accept_handler(
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\tornado\netutil.py", line 268, in add_accept_handler
io_loop.add_handler(sock, accept_handler, IOLoop.READ)
File "c:\users\sofia\onedrive\proyectos\django 3\shop\env\lib\site-packages\tornado\platform\asyncio.py", line 79, in add_handler
self.asyncio_loop.add_reader(
File "C:\Program Files\Python38\lib\asyncio\events.py", line 501, in add_reader
raise NotImplementedError
NotImplementedError
Can't be causing this error.
I have searched the documentation and found nothing like this error.

Answer 1

I have solved the problem by editing the file asyncio.py in tornado\platform adding:
import sys
if sys.platform == 'win32':
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

Answer 2

I had the same error.
Which version of python do you use? mine was 3.8 then I changed to 3.6 and everything works correctly.