Today, an error occurred during the Lean live trading session when the Charles Schwab API refreshed the token, causing the live trading session to be terminated. Please investigate the cause.

[dujinxin001]

20260305 17:38:13.397 ERROR:: OAuthTokenHandler.GetAccessToken: Failed to retrieve access token. Response: 
{"AccessToken":null,"TokenType":"Bearer","Expiration":"2026-03-05T18:07:13.388286Z","Success":false,"Errors":["Error refreshing access token."]}. Last known 
expiration: Not requested yet.
20260305 17:38:18.441 ERROR:: OAuthTokenHandler.GetAccessToken: Failed to retrieve access token. Response: 
{"AccessToken":null,"TokenType":"Bearer","Expiration":"2026-03-05T18:07:18.4414824Z","Success":false,"Errors":["Error refreshing access token."]}. Last known
expiration: Not requested yet

2026-03-05T18:03:37.6432557Z TRACE:: Engine.Main(): LEAN ALGORITHMIC TRADING ENGINE v2.5.0.0 Mode: DEBUG (64bit) Host: VM-16-3-ubuntu
2026-03-05T18:03:37.6501993Z TRACE:: Engine.Main(): Started 6:03 PM
2026-03-05T18:03:37.6799564Z TRACE:: JobQueue.NextJob(): Selected /LeanCLI/main.py
2026-03-05T18:03:38.6064590Z TRACE:: AlgorithmManager.CreateTokenBucket(): Initializing LeakyBucket: Capacity: 120 RefillAmount: 18 TimeInterval: 1440
2026-03-05T18:03:38.6249690Z TRACE:: Engine.Run(): Resource limits '0' CPUs. 2147483647 MB RAM.
2026-03-05T18:03:38.6262244Z TRACE:: TextSubscriptionDataSourceReader.SetCacheSize(): Setting cache size to 71582788 items
2026-03-05T18:03:38.6379757Z TRACE:: PythonInitializer.Initialize(): start...
2026-03-05T18:03:38.9706013Z TRACE:: PythonInitializer.Initialize(): ended
2026-03-05T18:03:38.9728441Z TRACE:: AlgorithmPythonWrapper(): Python version 3.11.14 (main, Oct 21 2025, 18:40:40) [GCC 11.2.0]: Importing python module main
2026-03-05T18:03:43.0462967Z TRACE:: AlgorithmPythonWrapper(): main successfully imported.
2026-03-05T18:03:43.0586573Z TRACE:: AlgorithmPythonWrapper(): Creating IAlgorithm instance.
2026-03-05T18:03:43.3245773Z TRACE:: LocalObjectStore.Initialize(): Storage Root: /Storage. StorageFileCount 9999999. StorageLimit 10240MB. StoragePermissions Read=True Write=True Delete=True
2026-03-05T18:03:43.3252605Z TRACE:: LiveTradingDataFeed.GetDataChannelProvider(): will use DataChannelProvider
2026-03-05T18:03:43.3285357Z TRACE:: BrokerageSetupHandler.CreateBrokerage(): creating brokerage 'CharlesSchwabBrokerage'
2026-03-05T18:03:43.3368531Z TRACE:: CharlesSchwabBrokerage.Initialize: found no data aggregator instance, creating QuantConnect.Lean.Engine.DataFeeds.AggregationManager
2026-03-05T18:03:49.7249090Z ERROR:: OAuthTokenHandler.GetAccessToken: Failed to retrieve access token. Response: {"AccessToken":null,"TokenType":"Bearer","Expiration":"2026-03-05T18:32:49.7149281Z","Success":false,"Errors":["Error refreshing access token."]}. Last known expiration: Not requested yet.
2026-03-05T18:03:54.8172245Z ERROR:: OAuthTokenHandler.GetAccessToken: Failed to retrieve access token. Response: {"AccessToken":null,"TokenType":"Bearer","Expiration":"2026-03-05T18:32:54.8133875Z","Success":false,"Errors":["Error refreshing access token."]}. Last known expiration: Not requested yet.
2026-03-05T18:03:59.8644419Z ERROR:: OAuthTokenHandler.GetAccessToken: Failed to retrieve access token. Response: {"AccessToken":null,"TokenType":"Bearer","Expiration":"2026-03-05T18:32:59.8641477Z","Success":false,"Errors":["Error refreshing access token."]}. Last known expiration: Not requested yet.
2026-03-05T18:04:04.9653460Z ERROR:: OAuthTokenHandler.GetAccessToken: Failed to retrieve access token. Response: {"AccessToken":null,"TokenType":"Bearer","Expiration":"2026-03-05T18:33:04.9649866Z","Success":false,"Errors":["Error refreshing access token."]}. Last known expiration: Not requested yet.
2026-03-05T18:04:04.9860062Z ERROR:: Engine.Run(): System.Exception: CharlesSchwabApiClient.SendRequestAsync: Unexpected error while sending request - OAuthTokenHandler.GetAccessToken: Authentication failed. Details: Error refreshing access token.
---> System.InvalidOperationException: OAuthTokenHandler.GetAccessToken: Authentication failed. Details: Error refreshing access token.
at QuantConnect.Brokerages.Authentication.OAuthTokenHandler2.GetAccessToken(CancellationToken cancellationToken) in Brokerages/Authentication/OAuthTokenHandler.cs:line 96 at QuantConnect.Brokerages.Authentication.TokenHandler.Send(HttpRequestMessage request, CancellationToken cancellationToken) in Brokerages/Authentication/TokenHandler.cs:line 106 at QuantConnect.Brokerages.Authentication.TokenHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) in Brokerages/Authentication/TokenHandler.cs:line 86 at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken) at QuantConnect.Brokerages.CharlesSchwab.Api.CharlesSchwabApiClient.a(HttpMethod A_0, String A_1, String A_2, String A_3) --- End of inner exception stack trace --- at QuantConnect.Brokerages.CharlesSchwab.Api.CharlesSchwabApiClient.a(HttpMethod A_0, String A_1, String A_2, String A_3) at QuantConnect.Brokerages.CharlesSchwab.Api.CharlesSchwabApiClient.a[a](HttpMethod A_0, String A_1, String A_2, String A_3, Boolean A_4) at QuantConnect.Brokerages.CharlesSchwab.Api.CharlesSchwabApiClient.a[a](HttpMethod A_0, String A_1, String A_2, Boolean A_3) at QuantConnect.Brokerages.CharlesSchwab.Api.CharlesSchwabApiClient.GetAccountNumber(String accountNumber) at QuantConnect.Extensions.SynchronouslyAwaitTaskResult[TResult](Task1 task) in Common/Extensions.cs:line 3434
at QuantConnect.Brokerages.CharlesSchwab.Api.CharlesSchwabApiClient..ctor(String A_0, String A_1, TokenHandler A_2)
at QuantConnect.Brokerages.CharlesSchwab.Api.CharlesSchwabApiClient..ctor(ApiConnection leanApiClient, String brokerageName, String baseUrl, String accountNumber, String deployId, Int32 projectId)
at QuantConnect.Brokerages.CharlesSchwab.CharlesSchwabBrokerage.Initialize(String baseUrl, String appKey, String secret, String accountNumber, String redirectUrl, String authorizationCodeFromUrl, String refreshToken, String leanDeployId, Int32 leanProjectId, IOrderProvider orderProvider, ISecurityProvider securityProvider)
at QuantConnect.Brokerages.CharlesSchwab.CharlesSchwabBrokerage..ctor(String baseUrl, String accountNumber, String leanDeployId, Int32 leanProjectId, IOrderProvider orderProvider, ISecurityProvider securityProvider)
at QuantConnect.Brokerages.CharlesSchwab.CharlesSchwabBrokerage..ctor(String baseUrl, String accountNumber, String leanDeployId, Int32 leanProjectId, IAlgorithm algorithm)
at QuantConnect.Brokerages.CharlesSchwab.CharlesSchwabBrokerageFactory.CreateBrokerage(LiveNodePacket job, IAlgorithm algorithm)
at QuantConnect.Lean.Engine.Setup.BrokerageSetupHandler.CreateBrokerage(AlgorithmNodePacket algorithmNodePacket, IAlgorithm uninitializedAlgorithm, IBrokerageFactory& factory) in Engine/Setup/BrokerageSetupHandler.cs:line 137
at QuantConnect.Lean.Engine.Engine.Run(AlgorithmNodePacket job, AlgorithmManager manager, String assemblyPath, WorkerThread workerThread) in Engine/Engine.cs:line 140
2026-03-05T18:04:04.9892661Z TRACE:: JOB HANDLERS:
DataFeed: QuantConnect.Lean.Engine.DataFeeds.LiveTradingDataFeed
Setup: QuantConnect.Lean.Engine.Setup.BrokerageSetupHandler
RealTime: QuantConnect.Lean.Engine.RealTime.LiveTradingRealTimeHandler
Results: QuantConnect.Lean.Engine.Results.LiveTradingResultHandler
Transactions: QuantConnect.Lean.Engine.TransactionHandlers.BrokerageTransactionHandler
Object Store: QuantConnect.Lean.Engine.Storage.LocalObjectStore
History Provider:
Brokerage:
Data Provider: QuantConnect.Lean.Engine.DataFeeds.DefaultDataProvider

2026-03-05T18:04:04.9913904Z ERROR:: Algorithm.Initialize() Error: CharlesSchwabApiClient.SendRequestAsync: Unexpected error while sending request - OAuthTokenHandler.GetAccessToken: Authentication failed. Details: Error refreshing access token. Stack Trace: CharlesSchwabApiClient.SendRequestAsync: Unexpected error while sending request - OAuthTokenHandler.GetAccessToken: Authentication failed. Details: Error refreshing access token.
CharlesSchwabApiClient.SendRequestAsync: Unexpected error while sending request - OAuthTokenHandler.GetAccessToken: Authentication failed. Details: Error refreshing access token.
2026-03-05T18:04:04.9914467Z TRACE:: LiveTradingResultHandler.Run(): Ending Thread...
2026-03-05T18:04:04.9941473Z TRACE:: StopSafely(): Waiting for 'Result Thread' thread to stop...
2026-03-05T18:04:04.9960501Z TRACE:: LiveTradingResultHandler.SendFinalResult(): Starting...
2026-03-05T18:04:05.0606862Z TRACE:: LiveTradingResultHandler.SendFinalResult(): Finished storing results. Start sending...
2026-03-05T18:04:05.0607882Z TRACE:: LiveTradingResultHandler.SendFinalResult(): Ended
2026-03-05T18:04:05.0619448Z TRACE:: Engine.Run(): Disposing of setup handler...
2026-03-05T18:04:05.0631840Z TRACE:: BrokerageSetupHandler.Setup(): did not find any data queue handler to dispose
2026-03-05T18:04:05.0632388Z TRACE:: Engine.Main(): Analysis Completed and Results Posted.
2026-03-05T18:04:05.0701429Z TRACE:: Engine.Main(): Packet removed from queue: L-3457357721
2026-03-05T18:04:05.0704035Z TRACE:: LeanEngineSystemHandlers.Dispose(): start...
2026-03-05T18:04:05.0717107Z TRACE:: LeanEngineSystemHandlers.Dispose(): Disposed of system handlers.
2026-03-05T18:04:05.0720576Z TRACE:: LeanEngineAlgorithmHandlers.Dispose(): start...
2026-03-05T18:04:05.0729703Z TRACE:: LocalObjectStore.Dispose(): start...
2026-03-05T18:04:05.0730085Z TRACE:: LocalObjectStore.Dispose(): end
2026-03-05T18:04:05.0732098Z TRACE:: LeanEngineAlgorithmHandlers.Dispose(): Disposed of algorithm handlers.