When deploying Charles Schwab locally, an error will occur after the market closes every day, causing the strategy to terminate.

2025-10-15T04:30:01.5894594Z ERROR:: CharlesSchwabWebSocketClientWrapper.ParseResponse: Error during deserialization. Exception: StreamDataConverter.CreateStreamDataResponse.jToken: {
"service": "ACCT_ACTIVITY",
"timestamp": 1760502601557,
"command": "SUBS",
"content": [
{
"seq": 11,
"key": "Account Activity",
"1": "89874630",
"2": "",
"3": "Feature not supported"
}
]
}. JSON: {"data":[{"service":"ACCT_ACTIVITY", "timestamp":1760502601557,"command":"SUBS","content":[{"seq":11,"key":"Account Activity","1":"89874630","2":"","3":"Feature not supported"}]}]}
2025-10-15T04:30:01.5901651Z ERROR:: Brokerage.OnMessage(): Error - Code: -1 - CharlesSchwabWebSocketClientWrapper.ParseResponse: Unable to parse response.
2025-10-15T04:30:01.6904506Z ERROR:: Extensions.SetRuntimeError(): Extensions.SetRuntimeError(): RuntimeError at 10/15/2025 04:30:01 UTC. Context: Brokerage Error System.Exception: CharlesSchwabWebSocketClientWrapper.ParseResponse: Unable to parse response.
2025-10-15T04:30:02.0016919Z ERROR:: AlgorithmManager.Run(): Stopping, encountered a runtime error at 10/15/2025 4:30:02 AM UTC.
2025-10-15T04:30:02.0022652Z TRACE:: Engine.Run(): Exiting Algorithm Manager
2025-10-15T04:30:02.0032923Z TRACE:: LiveTradingDataFeed.Exit(): Start. Setting cancellation token...
2025-10-15T04:30:02.0046075Z TRACE:: StopSafely(): Waiting for 'CustomDataExchange' thread to stop...
2025-10-15T04:30:02.0046915Z TRACE:: BaseDataExchange(CustomDataExchange).ConsumeQueue(): Exiting...
2025-10-15T04:30:02.0049337Z TRACE:: LiveTradingDataFeed.Exit(): Exit Finished.
2025-10-15T04:30:02.0051483Z TRACE:: FileSystemDataFeed.Exit(): Start. Setting cancellation token...
2025-10-15T04:30:02.0081946Z TRACE:: FileSystemDataFeed.Exit(): Exit Finished.
2025-10-15T04:30:02.0083550Z TRACE:: Engine.Run(): Sending runtime error to user...
2025-10-15T04:30:02.0121965Z TRACE:: StopSafely(): Waiting for 'Transaction Thread 0' thread to stop...
2025-10-15T04:30:02.0134727Z TRACE:: BrokerageTransactionHandler.Run(): Ending Thread 0...
2025-10-15T04:30:02.0137881Z TRACE:: StopSafely(): Waiting for 'RealTime Thread' thread to stop...
2025-10-15T04:30:02.4267539Z TRACE:: Log: Runtime Error: CharlesSchwabWebSocketClientWrapper.ParseResponse: Unable to parse response.
2025-10-15T04:30:02.4269264Z ERROR:: Runtime Error: CharlesSchwabWebSocketClientWrapper.ParseResponse: Unable to parse response.
CharlesSchwabWebSocketClientWrapper.ParseResponse: Unable to parse response.
2025-10-15T04:30:03.0000417Z TRACE:: LiveTradingRealTimeHandler.Run(): Exiting thread... Exit triggered: True
2025-10-15T04:30:03.0054014Z TRACE:: DataManager.RemoveSubscription(): Removed QC-UNIVERSE-USERDEFINED-USA-EQUITY,#0,QC-UNIVERSE-USERDEFINED-USA-EQUITY,Minute,TradeBar,Trade,Adjusted,OpenInterest,Internal
2025-10-15T04:30:03.0104375Z TRACE:: DataManager.RemoveSubscription(): Removed QQQ,#0,QQQ,Minute,TradeBar,Trade,Adjusted,OpenInterest
2025-10-15T04:30:03.0109246Z TRACE:: EventBasedDataQueueHandlerSubscriptionManager.Unsubscribe(): SPY
2025-10-15T04:30:03.0187644Z TRACE:: DataManager.RemoveSubscription(): Removed SPY,#0,SPY,Minute,TradeBar,Trade,Adjusted,OpenInterest,Internal
2025-10-15T04:30:03.0189186Z TRACE:: DataManager.RemoveSubscription(): Removed TQQQ,#0,TQQQ,Minute,TradeBar,Trade,Adjusted,OpenInterest
2025-10-15T04:30:03.0189638Z TRACE:: EventBasedDataQueueHandlerSubscriptionManager.Unsubscribe(): QQQ
2025-10-15T04:30:03.0192071Z TRACE:: DataManager.RemoveSubscription(): Removed QQQ,#0,QQQ,Minute,QuoteBar,Quote,Adjusted,OpenInterest
2025-10-15T04:30:03.0222334Z TRACE:: EventBasedDataQueueHandlerSubscriptionManager.Unsubscribe(): TQQQ
2025-10-15T04:30:03.0225013Z TRACE:: DataManager.RemoveSubscription(): Removed TQQQ,#0,TQQQ,Minute,QuoteBar,Quote,Adjusted,OpenInterest
2025-10-15T04:30:03.0230029Z TRACE:: StopSafely(): Waiting for 'Isolator Thread' thread to stop...
2025-10-15T04:30:03.0251645Z TRACE:: StopSafely(): Waiting for 'RealTimeScheduleEventService' thread to stop...
2025-10-15T04:30:03.0275819Z TRACE:: LiveTradingResultHandler.Run(): Ending Thread...
2025-10-15T04:30:03.0291861Z TRACE:: StopSafely(): Waiting for 'Result Thread' thread to stop...
2025-10-15T04:30:03.0306651Z TRACE:: LiveTradingResultHandler.SendFinalResult(): Starting...
2025-10-15T04:30:03.0566950Z TRACE:: CharlesSchwabWebSocketClientWrapper.HandleWebSocketMessage.WS.Response.JSON: {"response":[{"service":"LEVELONE_EQUITIES","command":"UNSUBS","requestid":"5","SchwabClientCorrelId":"1898160d-345f-1928-d30d-f401fcdde76a","timestamp":1760502603034,"content":{"code":0,"msg":"UNSUBS command succeeded"}}]}
2025-10-15T04:30:03.0844028Z TRACE:: CharlesSchwabWebSocketClientWrapper.HandleWebSocketMessage.WS.Response.JSON: {"response":[{"service":"LEVELONE_EQUITIES","command":"UNSUBS","requestid":"6","SchwabClientCorrelId":"1898160d-345f-1928-d30d-f401fcdde76a","timestamp":1760502603035,"content":{"code":0,"msg":"UNSUBS command succeeded"}}]}
2025-10-15T04:30:03.0865836Z TRACE:: CharlesSchwabWebSocketClientWrapper.HandleWebSocketMessage.WS.Response.JSON: {"response":[{"service":"LEVELONE_EQUITIES","command":"UNSUBS","requestid":"7","SchwabClientCorrelId":"1898160d-345f-1928-d30d-f401fcdde76a","timestamp":1760502603038,"content":{"code":0,"msg":"UNSUBS command succeeded"}}]}
2025-10-15T04:30:03.1391851Z TRACE:: LiveTradingResultHandler.SendFinalResult(): Finished storing results. Start sending...
2025-10-15T04:30:03.1392155Z TRACE:: LiveTradingResultHandler.SendFinalResult(): Ended
2025-10-15T04:30:03.1428223Z TRACE:: Engine.Run(): Disconnecting from brokerage...
2025-10-15T04:30:03.2099642Z TRACE:: WebSocketClientWrapper connection task ended: wss://streamer-api.schwab.com/ws
2025-10-15T04:30:03.2130925Z TRACE:: WebSocketClientWrapper.OnClose(): Connection closed (IsOpen:False, State:Aborted): wss://streamer-api.schwab.com/ws
2025-10-15T04:30:03.2132638Z TRACE:: Engine.Run(): Disposing of setup handler...
2025-10-15T04:30:03.2140786Z TRACE:: BrokerageSetupHandler.Setup(): Found data queue handler to dispose: QuantConnect.Brokerages.CharlesSchwab.CharlesSchwabBrokerage
2025-10-15T04:30:03.2141538Z TRACE:: Engine.Main(): Analysis Completed and Results Posted.
2025-10-15T04:30:03.2145089Z TRACE:: StopSafely(): Waiting for 'Transaction Thread 0' thread to stop...
2025-10-15T04:30:03.2145741Z TRACE:: StopSafely(): Waiting for 'RealTime Thread' thread to stop...
2025-10-15T04:30:03.2223535Z TRACE:: Engine.Main(): Packet removed from queue: L-3533130984
2025-10-15T04:30:03.2225240Z TRACE:: LeanEngineSystemHandlers.Dispose(): start...
2025-10-15T04:30:03.2256999Z TRACE:: LeanEngineSystemHandlers.Dispose(): Disposed of system handlers.
2025-10-15T04:30:03.2259720Z TRACE:: LeanEngineAlgorithmHandlers.Dispose(): start...
2025-10-15T04:30:03.2262362Z TRACE:: LocalObjectStore.Dispose(): start...
2025-10-15T04:30:03.2262609Z TRACE:: LocalObjectStore.Dispose(): end
2025-10-15T04:30:03.2263574Z TRACE:: LeanEngineAlgorithmHandlers.Dispose(): Disposed of algorithm handlers.

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Here's a targeted guide and example code for Dujinxin to resolve the Charles Schwab "Account Activity" subscription runtime error in QuantConnect:

Why This Error Occurs

The Charles Schwab integration with QuantConnect does not support subscribing to the "Account Activity" stream via its WebSocket API. Attempting to subscribe to this feature results in a JSON message like:

{
  "service": "ACCT_ACTIVITY",
  "command": "SUBS",
  "content": [
    { "key": "Account Activity", "3": "Feature not supported" }
  ]
}

Attempting to parse/handle this unsupported feature triggers deserialization errors, leading QuantConnect to raise a runtime error and halt your algorithm.

How to Prevent This Error

Do not call or attempt to subscribe to account activity streams when using Charles Schwab as your brokerage; no QuantConnect API or custom data-subscription calls should reference "Account Activity".
If QuantConnect or your code attempts to subscribe automatically, you must defensively handle and ignore brokerage errors related to this stream in your on_brokerage_message handler.

Example of Robust Error Handling in Your Algorithm

from AlgorithmImports import *

class SchwabSafeStreamingAlgorithm(QCAlgorithm):
    """
    Example Blueprint:
      1. Avoid the Charles Schwab “Account Activity” stream (it’s unsupported).
      2. Add robust OnBrokerageMessage() logic that filters out the
         resulting unsupported-feature error, so the algorithm never stops.
    """

    def initialize(self) -> None:
        self.set_start_date(2021, 1, 1)
        self.set_end_date(2022, 1, 1)
        self.set_cash(100_000)
        self._symbol = self.add_equity("SPY", Resolution.MINUTE).symbol

        # DO NOT subscribe to “Account Activity” with Schwab!
        # self.brokerage.subscribe_account_activity()   # ← never call this

        self._ignored_brokerage_keywords = [
            "account activity subscription is not supported",
            "unsupported account activity stream",
            "feature not supported"
        ]
        self._unsupported_warning_logged = False

    def on_brokerage_message(self, message_event: BrokerageMessageEvent) -> None:
        """Filter and ignore known 'unsupported' errors."""
        if message_event is None:
            return

        message = message_event.message or ""
        message_lower = message.lower()

        # 1) Swallow ONLY the well-known unsupported-feature errors
        for keyword in self._ignored_brokerage_keywords:
            if keyword in message_lower:
                if not self._unsupported_warning_logged:
                    self.debug(f"IGNORED Schwab warning: '{message}'")
                    self._unsupported_warning_logged = True
                return  # exit gracefully

        # 2) Otherwise, log all other brokerage messages normally
        if message_event.type == BrokerageMessageType.ERROR:
            self.error(f"Brokerage error: {message}")
        else:
            self.debug(f"Brokerage message: {message}")

    def on_data(self, data: Slice) -> None:
        if not self.portfolio.invested and self.securities[self._symbol].price > 0:
            self.market_order(self._symbol, 10)

Summary of Best Practices

Never attempt to subscribe to Account Activity (or other unsupported streams) with Charles Schwab.
Implement a defensive on_brokerage_message handler to swallow/ignore Schwab's unsupported-feature errors.
Log a debug message the first time you swallow such an error for later reference.
Let all other brokerage errors or warnings bubble up as usual, so real problems are surfaced.

What If You Need Account Activity Features?

If you require live account activity monitoring (orders, deposits, etc.), you'll need to:

Use a different brokerage integration that does support such streams, or
Handle portfolio/account state by polling or via order events, not by subscribing to Schwab's Account Activity.

This approach will safeguard your algorithm from future breaks whenever the Account Activity feature is triggered or queried (either by you or future QuantConnect changes).

Let me know if you need help further customizing this error-handling logic!

Sources: Brokerages - QuantConnect.com, Brokerage Activity Event Handling Algorithm, Charles Schwab - QuantConnect.com, Brokerage Message Handler - QuantConnect.com

Mia Alissi

STAFF Pro ,

Dujinxin INVESTOR

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When deploying Charles Schwab locally, an error will occur after the market closes every day, causing the strategy to terminate.

Why This Error Occurs

How to Prevent This Error

Example of Robust Error Handling in Your Algorithm

Summary of Best Practices

What If You Need Account Activity Features?

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When deploying Charles Schwab locally, an error will occur after the market closes every day, causing the strategy to terminate.

Why This Error Occurs

How to Prevent This Error

Example of Robust Error Handling in Your Algorithm

Summary of Best Practices

What If You Need Account Activity Features?

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