visual studio debug message after send "hello"

debug.log

Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request starting HTTP/1.1 POST http://localhost:3978/api/messages application/json 713
Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executing endpoint 'Microsoft.BotBuilderSamples.Controllers.BotController.PostAsync (CoreBot)'
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Route matched with {action = "Post", controller = "Bot"}. Executing controller action with signature System.Threading.Tasks.Task PostAsync() on controller Microsoft.BotBuilderSamples.Controllers.BotController (CoreBot).
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Executing action method Microsoft.BotBuilderSamples.Controllers.BotController.PostAsync (CoreBot) - Validation state: Valid
Microsoft.Bot.Builder.Integration.AspNet.Core.BotFrameworkHttpAdapter: Information: Received an incoming activity.  ActivityId: ba2e7f40-d072-11ea-a40d-8710cbf0ac95
Microsoft.BotBuilderSamples.Bots.DialogBot: Information: Running dialog with Message Activity.
CoreBot Information: 0 : 'hello' ==> activityReceived ==> TextPrompt 
CoreBot Information: 0 : 'hello' ==> activityReceived ==> MainDialog 
CoreBot Information: 0 : 'hello' ==> EndDialog        ==> TextPrompt 
CoreBot Information: 0 : 'hello' ==> ResumeDialog     ==> WaterfallDialog 
'iisexpress.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.6\System.Web.HttpUtility.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'iisexpress.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.6\System.Collections.NonGeneric.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'iisexpress.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.6\System.Security.Cryptography.Encoding.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
Exception thrown: 'System.Net.Http.HttpRequestException' in System.Private.CoreLib.dll
Exception thrown: 'System.Net.Http.HttpRequestException' in System.Private.CoreLib.dll
Exception thrown: 'System.Net.Http.HttpRequestException' in System.Private.CoreLib.dll
Exception thrown: 'System.Net.Http.HttpRequestException' in System.Private.CoreLib.dll
'iisexpress.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.6\System.Diagnostics.StackTrace.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'iisexpress.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.6\System.Reflection.Metadata.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'iisexpress.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.6\System.Collections.Immutable.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
Microsoft.Bot.Builder.Integration.AspNet.Core.BotFrameworkHttpAdapter: Error: [OnTurnError] unhandled error : Response status code does not indicate success: 404 (Not Found).

System.Net.Http.HttpRequestException: Response status code does not indicate success: 404 (Not Found).
   at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
   at Microsoft.Bot.Builder.AI.Luis.LuisRecognizerOptionsV3.RecognizeAsync(ITurnContext turnContext, String utterance, LuisPredictionOptions options, HttpClient httpClient, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.AI.Luis.LuisRecognizerOptionsV3.RecognizeInternalAsync(ITurnContext turnContext, HttpClient httpClient, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.AI.Luis.LuisRecognizer.RecognizeInternalAsync(ITurnContext turnContext, LuisRecognizerOptions predictionOptions, Dictionary`2 telemetryProperties, Dictionary`2 telemetryMetrics, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.AI.Luis.LuisRecognizer.RecognizeAsync[T](ITurnContext turnContext, CancellationToken cancellationToken)
   at Microsoft.BotBuilderSamples.FlightBookingRecognizer.RecognizeAsync[T](ITurnContext turnContext, CancellationToken cancellationToken) in C:\Users\t-wepeng\source\repos\botbuilder-samples\samples\csharp_dotnetcore\13.core-bot\FlightBookingRecognizer.cs:line 47
   at Microsoft.BotBuilderSamples.Dialogs.MainDialog.ActStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken) in C:\Users\t-wepeng\source\repos\botbuilder-samples\samples\csharp_dotnetcore\13.core-bot\Dialogs\MainDialog.cs:line 67
   at Microsoft.Bot.Builder.Dialogs.WaterfallDialog.OnStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.WaterfallDialog.RunStepAsync(DialogContext dc, Int32 index, DialogReason reason, Object result, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.WaterfallDialog.ResumeDialogAsync(DialogContext dc, DialogReason reason, Object result, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.DialogContext.EndDialogAsync(Object result, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.Prompt`1.ContinueDialogAsync(DialogContext dc, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.DialogContext.ContinueDialogAsync(CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.ComponentDialog.ContinueDialogAsync(DialogContext outerDc, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.DialogContext.ContinueDialogAsync(CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.Dialogs.DialogExtensions.RunAsync(Dialog dialog, ITurnContext turnContext, IStatePropertyAccessor`1 accessor, CancellationToken cancellationToken)
   at Microsoft.BotBuilderSamples.Bots.DialogBot`1.OnMessageActivityAsync(ITurnContext`1 turnContext, CancellationToken cancellationToken) in C:\Users\t-wepeng\source\repos\botbuilder-samples\samples\csharp_dotnetcore\13.core-bot\Bots\DialogBot.cs:line 48
   at Microsoft.Bot.Builder.ActivityHandler.OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken)
   at Microsoft.BotBuilderSamples.Bots.DialogBot`1.OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken) in C:\Users\t-wepeng\source\repos\botbuilder-samples\samples\csharp_dotnetcore\13.core-bot\Bots\DialogBot.cs:line 36
   at Microsoft.Bot.Builder.BotFrameworkAdapter.TenantIdWorkaroundForTeamsMiddleware.OnTurnAsync(ITurnContext turnContext, NextDelegate next, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.MiddlewareSet.ReceiveActivityWithStatusAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken)
   at Microsoft.Bot.Builder.BotAdapter.RunPipelineAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken)
'iisexpress.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.6\Microsoft.Win32.Registry.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
Microsoft.Bot.Builder.Integration.AspNet.Core.BotFrameworkHttpAdapter: Information: Sending activity.  ReplyToId: ba2e7f40-d072-11ea-a40d-8710cbf0ac95
Microsoft.Bot.Builder.Integration.AspNet.Core.BotFrameworkHttpAdapter: Information: Sending activity.  ReplyToId: ba2e7f40-d072-11ea-a40d-8710cbf0ac95
Microsoft.Bot.Builder.Integration.AspNet.Core.BotFrameworkHttpAdapter: Information: Sending activity.  ReplyToId: ba2e7f40-d072-11ea-a40d-8710cbf0ac95
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Executed action method Microsoft.BotBuilderSamples.Controllers.BotController.PostAsync (CoreBot), returned result Microsoft.AspNetCore.Mvc.EmptyResult in 2723.0035ms.
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Executed action Microsoft.BotBuilderSamples.Controllers.BotController.PostAsync (CoreBot) in 2742.4097ms
Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executed endpoint 'Microsoft.BotBuilderSamples.Controllers.BotController.PostAsync (CoreBot)'
Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request finished in 2753.3073ms 200