Aspnetcore: HTTP Error 500.30 - ANCM In-Process Start Failure

[Svek]

I am getting a really confusing error that I can't seem to resolve. When running with the latest and running with InProcess

<PropertyGroup>
  <TargetFramework>netcoreapp3.1</TargetFramework>
  <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
</PropertyGroup>

It seems like when you try to run the following,

public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration((hostingContext, config) =>
            {
            })
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.ConfigureServices(services =>
                {
                    services.AddControllersWithViews();
                })
                .Configure(app =>
                {
                    var loggerFactory = app.ApplicationServices
                        .GetRequiredService<ILoggerFactory>();
                    var logger = loggerFactory.CreateLogger<Program>();
                    var env = app.ApplicationServices.GetRequiredService<IWebHostEnvironment>();
                    var config = app.ApplicationServices.GetRequiredService<IConfiguration>();

                    logger.LogInformation("Logged in Configure");

                    if (env.IsDevelopment())
                    {
                        app.UseDeveloperExceptionPage();
                    }
                    else
                    {
                        app.UseExceptionHandler("/Home/Error");
                        app.UseHsts();
                    }

                    var configValue = config["MyConfigKey"];
                });
            });
        });
}

_Source: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/startup?view=aspnetcore-3.1#configure-services-without-startup_

We get the following error...

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=Microsoft.AspNetCore.Server.IIS
  StackTrace:
   at Microsoft.AspNetCore.Hosting.WebHostBuilderIISExtensions.<>c__DisplayClass0_0.<UseIIS>b__2(IISServerOptions options)
   at Microsoft.Extensions.Options.ConfigureNamedOptions`1.Configure(String name, TOptions options)
   at Microsoft.Extensions.Options.OptionsFactory`1.Create(String name)
   at Microsoft.Extensions.Options.OptionsManager`1.<>c__DisplayClass5_0.<Get>b__0()
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.get_Value()
   at Microsoft.Extensions.Options.OptionsCache`1.GetOrAdd(String name, Func`1 createOptions)
   at Microsoft.Extensions.Options.OptionsManager`1.Get(String name)
   at Microsoft.Extensions.Options.OptionsManager`1.get_Value()
   at Microsoft.AspNetCore.Server.IIS.Core.IISHttpServer..ctor(IISNativeApplication nativeApplication, IHostApplicationLifetime applicationLifetime, IAuthenticationSchemeProvider authentication, IOptions`1 options, ILogger`1 logger)
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite singletonCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite singletonCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitIEnumerable(IEnumerableCallSite enumerableCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite singletonCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass1_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T](IServiceProvider provider)
   at Microsoft.Extensions.Hosting.Internal.Host.<StartAsync>d__9.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.<RunAsync>d__4.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.<RunAsync>d__4.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)
   at Erx.OneCircle.Api.Program.Main(String[] args) in C:\Visual Studio Online\ERX\One Circle\Erx.OneCircle.Api\Program.cs:line 25

  This exception was originally thrown at this call stack:
    Microsoft.AspNetCore.Hosting.WebHostBuilderIISExtensions.UseIIS.AnonymousMethod__2(Microsoft.AspNetCore.Builder.IISServerOptions)
    ...
    [Call Stack Truncated]

[Tratcher]

Can you share the rest of your project so we can see your dependency versions?

[Svek]

I think I have been able to narrow down the issue. I was trying to replicate the problem in a new project and it didn't seem to reoccur. After doing a bit more digging around with dependencies in my former project I found that there was a reference to another class library, that has a reference to Microsoft.AspNetCore (v2.2.0).

If you update the project file to my example previously provided to this:

<PropertyGroup>
  <TargetFramework>netcoreapp3.1</TargetFramework>
  <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
</PropertyGroup>

<ItemGroup>
  <PackageReference Include="Microsoft.AspNetCore" Version="2.2.0" />
</ItemGroup>

The issue can be replicated.

[Tratcher]

That is certainly an issue. Remove all 2.x dependencies from your 3.x project.

[Svek]

Not to be overly opinionated on this -- but it seems a bit strange that there is no issues when running this with the OutOfProcess instead of using InProcess.

The debugging has been quite nightmarish to figure out the root cause.

[Tratcher]

You're supposed to remove the 2.2 dependencies for OutOfProcess too, it just happens to be a bigger problem when running InProcess.

[Svek]

Understood. I am just a bit frustrated with the migration path as it wasn't super intuitive where to locate the problem.

Thank you for helping me out, though.

[Svek]

The class library that I am using creates an instance of WebHost which is part of Microsoft.AspNetCore.App.dll (3.1). I'm a bit stumped on where to get that package...

I also tried to get Microsoft.AspNetCore.App.Ref with no success either.

[Svek]

My current workaround was to change the class library csproj
from

<Project Sdk="Microsoft.NET.Sdk">

to

<Project Sdk="Microsoft.NET.Sdk.Web">

and then throwing in an empty main method static void Main() { } to keep the compiler happy.

It would be great to know how to fix this properly.

[Svek]

Well... It turns out the only package that worked is Microsoft.AspNetCore.TestHost

[Tratcher]

https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.1&tabs=visual-studio#remove-obsolete-package-references
https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.1&tabs=visual-studio#framework-reference
https://devblogs.microsoft.com/aspnet/a-first-look-at-changes-coming-in-asp-net-core-3-0/
https://github.com/aspnet/Announcements/issues/325

[Svek]

Oh. That's perfect. The first link gave me the right answer.

<ItemGroup>
  <FrameworkReference Include="Microsoft.AspNetCore.App" />
</ItemGroup>

Thank you!

[werddomain]

i have the same problem. But in my case the error has happen just after updating visual studio. I did not change anything to the references.

[Svek]

You have to check for any rogue references to 2.x -- it was difficult for me to find the root cause, I feel your pain in that experience.