Erreur de fleur non implémentée

# NotImplementedError for flower is a known issue on Windows
# this file if using a venv
C:\path\to\your\project\venv\lib\site-packages\tornado\platform\asyncio.py
# this file if not using venv
C:\Users\username\AppData\Local\Programs\Python\Python39\Lib\site-packages\tornado\platform\asyncio.py
# this file if you have it set up in the root of our project 
C:\path\to\your\project\flowerconfig.py 
  
import asyncio
import sys

if sys.platform == 'win32':
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
Trained Tuna