Traceback (most recent call last):


 "C:\ProgramData\Anaconda3\lib\site-packages\spyder\widgets\ipythonconsole\client.py", line 561, in show_time

elapsed_time = time() - self.t0
TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'

Traceback (most recent call last):


 "client.py", line 14, in <module>

sio.connect('http://' + server_address + ':3000')


 "/usr/local/lib/python3.8/dist-packages/socketio/client.py", line 280, in connect

raise exceptions.ConnectionError(exc.args[0]) from None
socketio.exceptions.ConnectionError: OPEN packet not returned by server
