Question

I am following the service stack “Hello World” tutorial from http://www.servicestack.net/ServiceStack.Hello/ . But when I am trying to start the asp.net application it says “Value can’t be null. Parameter Name: EndpointHost.Config”.

The full exception text is:

[ArgumentNullException: Der Wert darf nicht NULL sein.
Parametername: EndpointHost.Config]

[ConfigurationErrorsException: ServiceStack: AppHost does not exist or has not been initialized. Make sure you have created an AppHost and started it with 'new AppHost().Init();' in your Global.asax Application_Start()]
   ServiceStack.WebHost.Endpoints.ServiceStackHttpHandlerFactory..cctor() in C:\src\ServiceStack\src\ServiceStack\WebHost.EndPoints\ServiceStackHttpHandlerFactory.cs:45

[TypeInitializationException: Der Typeninitialisierer für "ServiceStack.WebHost.Endpoints.ServiceStackHttpHandlerFactory" hat eine Ausnahme verursacht.]

[TargetInvocationException: Ein Aufrufziel hat einen Ausnahmefehler verursacht.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +86
   System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +230
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +67
   System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +1051
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +111
   System.Web.Configuration.HttpHandlerAction.Create() +57
   System.Web.Configuration.HandlerFactoryCache..ctor(HttpHandlerAction mapping) +19
   System.Web.HttpApplication.GetFactory(HttpHandlerAction mapping) +96
   System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +125
   System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +93
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

My global class is:

public class Global : System.Web.HttpApplication
    {
        /// Web Service Singleton AppHost
        public class InfoAppHost : AppHostBase
        {
            //Tell Service Stack the name of your application and where to find your web services
            public InfoAppHost()
                : base("Services", typeof(InfoService).Assembly) { }

            public override void Configure(Funq.Container container) { }
        }

        protected void Application_Start(object sender, EventArgs e)
        {
            //Initialize your application
            var appHost = new InfoAppHost();
            appHost.Init();
        }
    }

But it seems to never get called.
Compiling the example project from the homepage works fine – but I would like to follow the example from the homepage.
Any ideas how to solve this problem ?

Answer 1

I’ve deleted my test project and tried the tutorial once again.

When creating the Global.asax file I’ve deleted the whole class and made another class Global in this file. It seems Application_Start never got called in this class.