Hi All,

My code was running fine and suddenly encountered an error while fetching the margins and stopped abruptly.Please find the logs.Can you please explain why this error occurs and what can I do to avoid this in the future-

Unhandled Error
Traceback (most recent call last):
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\log.py", line 103, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\log.py", line 86, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\context.py", line 122, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\context.py", line 85, in callWithContext
    return func(*args,**kw)
--- <exception caught here> ---
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\selectreactor.py", line 149, in _doReadOrWrite
    why = getattr(selectable, method)()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\tcp.py", line 243, in doRead
    return self._dataReceived(data)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\tcp.py", line 249, in _dataReceived
    rval = self.protocol.dataReceived(data)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\protocols\tls.py", line 330, in dataReceived
    self._flushReceiveBIO()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\protocols\tls.py", line 295, in _flushReceiveBIO
    ProtocolWrapper.dataReceived(self, bytes)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\protocols\policies.py", line 120, in dataReceived
    self.wrappedProtocol.dataReceived(data)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\twisted\websocket.py", line 291, in dataReceived
    self._dataReceived(data)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1213, in _dataReceived
    self.consumeData()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1225, in consumeData
    while self.processData() and self.state != WebSocketProtocol.STATE_CLOSED:
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1591, in processData
    fr = self.onFrameEnd()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1713, in onFrameEnd
    self._onMessageEnd()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\twisted\websocket.py", line 319, in _onMessageEnd
    self.onMessageEnd()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 634, in onMessageEnd
    self._onMessage(payload, self.message_is_binary)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\twisted\websocket.py", line 322, in _onMessage
    self.onMessage(payload, isBinary)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kiteconnect-3.7.7-py3.7.egg\kiteconnect\ticker.py", line 71, in onMessage
    
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kiteconnect-3.7.7-py3.7.egg\kiteconnect\ticker.py", line 677, in _on_message
    
  File "E:/Timsy/PT/PT_Code2.py", line 330, in on_ticks
    margins = kite.margins()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kiteconnect-3.7.7-py3.7.egg\kiteconnect\connect.py", line 295, in margins
    
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kiteconnect-3.7.7-py3.7.egg\kiteconnect\connect.py", line 697, in _get
    
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kiteconnect-3.7.7-py3.7.egg\kiteconnect\connect.py", line 745, in _request
    
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kiteconnect-3.7.7-py3.7.egg\kiteconnect\connect.py", line 742, in _request
    
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\requests\api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\requests\sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\requests\sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\requests\adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='api.kite.trade', port=443): Max retries exceeded with url: /user/margins (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x019F37D0>: Failed to establish a new connection: [WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted'))

Unhandled Error
Traceback (most recent call last):
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kiteconnect-3.7.7-py3.7.egg\kiteconnect\ticker.py", line 534, in connect
    
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\base.py", line 1261, in run
    self.mainLoop()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\base.py", line 1273, in mainLoop
    self.doIteration(t)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\selectreactor.py", line 143, in doSelect
    _logrun(selectable, _drdw, selectable, method)
--- <exception caught here> ---
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\log.py", line 103, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\log.py", line 86, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\context.py", line 122, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\python\context.py", line 85, in callWithContext
    return func(*args,**kw)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\selectreactor.py", line 154, in _doReadOrWrite
    self._disconnectSelectable(selectable, why, method=="doRead")
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\posixbase.py", line 258, in _disconnectSelectable
    selectable.connectionLost(failure.Failure(why))
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\tcp.py", line 519, in connectionLost
    self._commonConnection.connectionLost(self, reason)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\internet\tcp.py", line 327, in connectionLost
    protocol.connectionLost(reason)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\protocols\tls.py", line 398, in connectionLost
    self._flushReceiveBIO()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\protocols\tls.py", line 295, in _flushReceiveBIO
    ProtocolWrapper.dataReceived(self, bytes)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\twisted\protocols\policies.py", line 120, in dataReceived
    self.wrappedProtocol.dataReceived(data)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\twisted\websocket.py", line 291, in dataReceived
    self._dataReceived(data)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1213, in _dataReceived
    self.consumeData()
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1225, in consumeData
    while self.processData() and self.state != WebSocketProtocol.STATE_CLOSED:
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1583, in processData
    fr = self.onFrameData(payload)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 1678, in onFrameData
    self._onMessageFrameData(payload)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\twisted\websocket.py", line 310, in _onMessageFrameData
    self.onMessageFrameData(payload)
  File "C:\Users\bc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\autobahn\websocket\protocol.py", line 608, in onMessageFrameData
    self.frame_data.append(payload)
builtins.AttributeError: 'NoneType' object has no attribute 'append'