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SocketIO(app) missing required positional argument 'mode'

I'm trying to get the simple example of Flask-SocketIO working, but I'm getting an error saying I'm missing a required positional argument 'mode', even though the documentation / official example don't show such a parameter:

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over 4 years ago · Santiago Trujillo
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After a lot of head-scratching, I realized it was happening because I accidentally imported the wrong SocketIO with my IDE: I imported socket.SocketIO instead of flask_socketio.SocketIO. When I fixed the import statement the error went away.

over 4 years ago · Santiago Trujillo Report
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