builtins.IndexError: bytearray index out of range

[FRANZEE]

`Unhandled Error
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/twisted/python/log.py", line 103, in callWithLogger
return callWithContext({"system": lp}, func, *args, **kw)
File "/usr/local/lib/python3.6/site-packages/twisted/python/log.py", line 86, in callWithContext
return context.call({ILogContext: newCtx}, func, *args, **kw)
File "/usr/local/lib/python3.6/site-packages/twisted/python/context.py", line 122, in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/local/lib/python3.6/site-packages/twisted/python/context.py", line 85, in callWithContext
return func(*args,**kw)
--- ---
File "/usr/local/lib/python3.6/site-packages/twisted/internet/selectreactor.py", line 149, in _doReadOrWrite
why = getattr(selectable, method)()
File "/usr/local/lib/python3.6/site-packages/twisted/internet/tcp.py", line 208, in doRead
return self._dataReceived(data)
File "/usr/local/lib/python3.6/site-packages/twisted/internet/tcp.py", line 214, in _dataReceived
rval = self.protocol.dataReceived(data)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 16, in dataReceived
self._accumulatePacket(data)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 47, in _accumulatePacket
self._processPacket(chunk)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 77, in _processPacket
packetHandler(packet, qos, dup, retain)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 108, in _event_connect
willTopic = self._decodeString(packet)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 500, in _decodeString
length = 256 * encodedString[0] + encodedString[1]
builtins.IndexError: bytearray index out of range

Unhandled Error
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/twisted/python/log.py", line 103, in callWithLogger
return callWithContext({"system": lp}, func, *args, **kw)
File "/usr/local/lib/python3.6/site-packages/twisted/python/log.py", line 86, in callWithContext
return context.call({ILogContext: newCtx}, func, *args, **kw)
File "/usr/local/lib/python3.6/site-packages/twisted/python/context.py", line 122, in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/local/lib/python3.6/site-packages/twisted/python/context.py", line 85, in callWithContext
return func(*args,**kw)
--- ---
File "/usr/local/lib/python3.6/site-packages/twisted/internet/selectreactor.py", line 149, in _doReadOrWrite
why = getattr(selectable, method)()
File "/usr/local/lib/python3.6/site-packages/twisted/internet/tcp.py", line 208, in doRead
return self._dataReceived(data)
File "/usr/local/lib/python3.6/site-packages/twisted/internet/tcp.py", line 214, in _dataReceived
rval = self.protocol.dataReceived(data)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 16, in dataReceived
self._accumulatePacket(data)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 47, in _accumulatePacket
self._processPacket(chunk)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 77, in _processPacket
packetHandler(packet, qos, dup, retain)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 108, in _event_connect
willTopic = self._decodeString(packet)
File "/Users/ash/PycharmProjects/mqtt_test_01/MQTT/MQTT.py", line 500, in _decodeString
length = 256 * encodedString[0] + encodedString[1]
builtins.IndexError: bytearray index out of range

`