Python server “Only one usage of each socket address is normally permitted”

Question

I\'m trying to create a very basic server in python that listens in on a port, creates a TCP connection when a client tries to connect, receives data, sends something back,

Answer 1

I changed my port number into different one and it works.

if __name__ == '__main__':
    socketio.run(app, debug = True, use_reloader = False, port=1111)