ProtoHeartbeatEvent giving an error

Hi, I will show the code that i'm using and the error that i get. Why is this error coming and is the code i'm using properly written?

My goal with the heartbeat is to keep my connection alive.

def sendProtoHeartbeatEvent():

print('Sending heartbeat...')

request = ProtoHeartbeatEvent()

request.payloadType = 51

deferred = client.send(request)

deferred.addErrback(onError)

 

def accountAuthResponseCallback(result):

sendProtoHeartbeatEvent()

 

def applicationAuthResponseCallback(result):

print("\nApplication authenticated")

request = ProtoOAAccountAuthReq()

request.ctidTraderAccountId = credentials["AccountId_ctrader"]

request.accessToken = credentials["AccessToken_ctrader"]

deferred = client.send(request)

deferred.addCallbacks(accountAuthResponseCallback, onError)

 

def onError(client, failure): # Call back for errors

print("\nMessage Error: ", failure)

 

def disconnected(client, reason): # Callback for client disconnection

print("\nDisconnected at ", str(datetime.datetime.now()),": ", reason)

 

def onMessageReceived(client, message): # Callback for receiving all messages

if message.payloadType in [ProtoHeartbeatEvent().payloadType, ProtoOAAccountAuthRes().payloadType, ProtoOAApplicationAuthRes().payloadType, ProtoOASymbolsListRes().payloadType, ProtoOAGetTrendbarsRes().payloadType]:

return

m = str(Protobuf.extract(message))

print('message proto:', m)

 

def connected(client): # Callback for client connection

print("\nConnected", str(datetime.datetime.now()))

request = ProtoOAApplicationAuthReq()

request.clientId = credentials["ClientId_ctrader"]

request.clientSecret = credentials["Secret_ctrader"]

deferred = client.send(request)

deferred.addCallbacks(applicationAuthResponseCallback, onError)

# Setting optional client callbacks

client.setConnectedCallback(connected)

client.setDisconnectedCallback(disconnected)

client.setMessageReceivedCallback(onMessageReceived)

 

# Starting the client service

client.startService()

# Run Twisted reactor, we imported it earlier

reactor.run()

And the error i get is this one
 

Sending heartbeat...
Unhandled error in Deferred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/defer.py", line 586, in timeItOut
    self.cancel()
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/defer.py", line 742, in cancel
    self.errback(Failure(CancelledError()))
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/defer.py", line 701, in errback
    self._startRunCallbacks(fail)
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/defer.py", line 764, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/defer.py", line 858, in _runCallbacks
    current.result = callback(  # type: ignore[misc]
builtins.TypeError: onError() missing 1 required positional argument: 'failure'