I couldn't find the reason for this exception.

[masm32]

Hi @miguelgrinberg ,

I want to send notifications to all clients.it has been raising exception after emitting.

@bus.on('event')
def send_socketio(event):
    socketio.emit('message_from_server', event, broadcast=True)

 File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/views.py", line 89, in view
    return self.dispatch_request(*args, **kwargs)
  File "/Volumes/Macintosh HD 2/python/hcs/venv/lib/python3.7/site-packages/flask/views.py", line 163, in dispatch_request
    return meth(*args, **kwargs)
TypeError: __call__() missing 2 required positional arguments: 'environ' and 'start_response'
```</div>

[miguelgrinberg]

Not enough information for me to know what's going on here. See the example in this repository for a working example, and work from there.

Also, please do not file issues on this project when all you have is a question. Use the discussion forum to ask.