OWIN HttpListener not located

Question

When I try to start :

WebApp.Start<SrvcHst>(new StartOptions { Port = 9956,       ServerFactory = "Microsoft.Owin.Host.HttpListener" }); 

I get the following exception. What could be the root cause?

System.MissingMemberException was caught   HResult=-2146233070   Message=The server factory could not be located for the given input: Microsoft.Owin.Host.HttpListener   Source=Microsoft.Owin.Hosting   StackTrace:        at Microsoft.Owin.Hosting.Engine.HostingEngine.ResolveServerFactory(StartContext context)        at Microsoft.Owin.Hosting.Engine.HostingEngine.Start(StartContext context)        at Microsoft.Owin.Hosting.Starter.DirectHostingStarter.Start(StartOptions options)        at Microsoft.Owin.Hosting.Starter.HostingStarter.Start(StartOptions options)        at Microsoft.Owin.Hosting.WebApp.StartImplementation(IServiceProvider services, StartOptions options)        at Microsoft.Owin.Hosting.WebApp.Start(StartOptions options)        at Microsoft.Owin.Hosting.WebApp.Start[TStartup](StartOptions options) 

Answer 1

You have to include Microsoft.Owin.Host.HttpListener.dll in your project references.

You can add it through NuGet.

However, if the code executing:

WebApp.Start<SrvcHst> (...); 

is contained within a class library, make sure that the executable consuming the library also includes the reference to Microsoft.Owin.Host.HttpListener.dll, or else it would not get deployed with your program, as there are no explicit references to it from the class library.

Have a look at your bin/Debug folder and make sure the DLL is there.