똑같이 따라 했는데 keyerror가 뜹니다.

작성한 코드 및 에러 메세지

C:\Users\PC\Desktop\스파르타\projects\bucket\venv\Scripts\python.exe C:\Users\PC\Desktop\스파르타\projects\bucket\app.py 

 * Serving Flask app 'app'

 * Debug mode: on

WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.

 * Running on all addresses (0.0.0.0)

 * Running on http://127.0.0.1:5000

 * Running on http://192.168.219.101:5000

Press CTRL+C to quit

 * Restarting with stat

 * Debugger is active!

 * Debugger PIN: 136-529-090

127.0.0.1 - - [17/Oct/2022 08:33:52] "POST /bucket HTTP/1.1" 500 -

Traceback (most recent call last):

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\venv\lib\site-packages\flask\app.py", line 2548, in __call__

  return self.wsgi_app(environ, start_response)

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\venv\lib\site-packages\flask\app.py", line 2528, in wsgi_app

  response = self.handle_exception(e)

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\venv\lib\site-packages\flask\app.py", line 2525, in wsgi_app

  response = self.full_dispatch_request()

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\venv\lib\site-packages\flask\app.py", line 1822, in full_dispatch_request

  rv = self.handle_user_exception(e)

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\venv\lib\site-packages\flask\app.py", line 1820, in full_dispatch_request

  rv = self.dispatch_request()

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\venv\lib\site-packages\flask\app.py", line 1796, in dispatch_request

  return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\app.py", line 25, in bucket_post

  bucket_receive = request.form['bucket_give']

 File "C:\Users\PC\Desktop\스파르타\projects\bucket\venv\lib\site-packages\werkzeug\datastructures.py", line 375, in __getitem__

  raise exceptions.BadRequestKeyError(key)

werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

KeyError: 'bucket_give'

 * Detected change in 'C:\\Users\\PC\\Desktop\\스파르타\\projects\\bucket\\app.py', reloading

 * Restarting with stat

 * Debugger is active!

 * Debugger PIN: 136-529-090