Exception thrown from Durable Function

exception_.cs

Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HLHEIEB48VMD", Request id "0HLHEIEB48VMD:00000001": An unhandled exception
was thrown by the application.
Microsoft.Azure.WebJobs.Host.FunctionInvocationException: Exception while executing function: HttpSyncStart ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Azure.WebJobs.Extensions.DurableTask.HttpApiHandler.GetClient(HttpRequestMessage
request)
   at Microsoft.Azure.WebJobs.Extensions.DurableTask.HttpApiHandler.WaitForCompletionOrCreateCheckStatusResponseAsync(HttpRequestMessage request, String instanceId, OrchestrationClientAttribute
attribute, TimeSpan timeout, TimeSpan retryInterval)
   at Microsoft.Azure.WebJobs.Extensions.DurableTask.DurableTaskExtension.WaitForCompletionOrCreateCheckStatusResponseAsync(HttpRequestMessage request, String instanceId, OrchestrationClientAttribute attribute, TimeSpan timeout, TimeSpan retryInterval)
   at Microsoft.Azure.WebJobs.DurableOrchestrationClient.WaitForCompletionOrCreateCheckStatusResponseAsync(HttpRequestMessage request, String instanceId, TimeSpan timeout, TimeSpan retryInterval)
   at HelloProj.HelloOrchestratorClient.Run(HttpRequestMessage req, DurableOrchestrationClient starter, String functionName, ILogger log) in C:\code\hello\github-issue-demos\Azure-Function-Demo-Complex\HelloOrchestratorClient.cs:line 48
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.InvokeAsync(Object instance, Object[] arguments) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionInvoker.cs:line 63
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.InvokeAsync(IFunctionInvoker invoker, ParameterHelper parameterHelper, CancellationTokenSource timeoutTokenSource, CancellationTokenSource functionCancellationTokenSource, Boolean throwOnTimeout, TimeSpan timerInterval, IFunctionInstance instance) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 561
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithWatchersAsync(IFunctionInstance instance, ParameterHelper parameterHelper, ILogger logger, CancellationTokenSource functionCancellationTokenSource) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 508
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(IFunctionInstance instance, ParameterHelper parameterHelper, IFunctionOutputDefinition outputDefinition, ILogger logger, CancellationTokenSource functionCancellationTokenSource) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 444
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(IFunctionInstance instance, FunctionStartedMessage message, FunctionInstanceLogEntry instanceLogEntry, ParameterHelper parameterHelper, ILogger logger, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 249
   --- End of inner exception stack trace ---
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(IFunctionInstance instance, FunctionStartedMessage message, FunctionInstanceLogEntry instanceLogEntry, ParameterHelper parameterHelper, ILogger logger, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 293
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.TryExecuteAsync(IFunctionInstance functionInstance, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:line 89
   at Microsoft.Azure.WebJobs.Host.Executors.ExceptionDispatchInfoDelayedException.Throw() in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\ExceptionDispatchInfoDelayedException.cs:line 28
   at Microsoft.Azure.WebJobs.JobHost.CallAsync(String name, IDictionary`2 arguments, CancellationToken cancellationToken) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\JobHost.cs:line 231
   at Microsoft.Azure.WebJobs.Script.WebHost.Features.FunctionExecutionFeature.ExecuteAsync(HttpRequest request, CancellationToken cancellationToken) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Features\FunctionExecutionFeature.cs:line 67
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.FunctionInvocationMiddleware.GetResultAsync(HttpContext context, IFunctionExecutionFeature functionExecution) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\FunctionInvocationMiddleware.cs:line 147
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.FunctionInvocationMiddleware.Invoke(HttpContext context) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\FunctionInvocationMiddleware.cs:line 56
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.HttpThrottleMiddleware.Invoke(HttpContext httpContext, IOptions`1 httpOptions, HttpRequestQueue requestQueue, HostPerformanceManager performanceManager, IMetricsLogger metricsLogger) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\HttpThrottleMiddleware.cs:line 66
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.HomepageMiddleware.Invoke(HttpContext context) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\HomepageMiddleware.cs:line 34
   at Microsoft.AspNetCore.Buffering.ResponseBufferingMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.HttpExceptionMiddleware.Invoke(HttpContext context) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\HttpExceptionMiddleware.cs:line 23
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.AppServiceHeaderFixupMiddleware.Invoke(HttpContext httpContext) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\AppServiceHeaderFixupMiddleware.cs:line 35
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.ScriptHostRequestServiceProviderMiddleware.Invoke(HttpContext httpContext, WebJobsScriptHostService manager) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\ScriptHostRequestServiceProviderMiddleware.cs:line 36
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.HostWarmupMiddleware.Invoke(HttpContext httpContext) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\HostWarmupMiddleware.cs:line 34
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.HostAvailabilityCheckMiddleware.Invoke(HttpContext httpContext, IScriptHostManager scriptHostManager) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\HostAvailabilityCheckMiddleware.cs:line 47
   at Microsoft.Azure.WebJobs.Script.WebHost.Middleware.EnvironmentReadyCheckMiddleware.Invoke(HttpContext httpContext, IScriptWebHostEnvironment webHostEnvironment) in C:\azure-webjobs-sdk-script\src\WebJobs.Script.WebHost\Middleware\EnvironmentReadyCheckMiddleware.cs:line 29
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
info: Microsoft.AspNetCore.Hosting.Internal.WebHost[2]
      Request finished in 11214.7605ms 500

For this question:

https://stackoverflow.com/questions/52738284/correct-use-of-azure-durable-function-serializing-complex-objects