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我正在研究Scott Allen关于Pluralsight的MVC 5基础课程

我在下面的代码中"使用(WebApp.Start(uri))"时收到错误.

错误是

An unhandled exception of type 'System.ArgumentException' occurred in Microsoft.Owin.dll
  System.ArgumentException was unhandled
  HResult=-2147024809
  Message=No conversion available between ConsoleApplication1.HelloWorldComponent and System.Func`2[System.Collections.Generic.IDictionary`2[System.String,System.Object],System.Threading.Tasks.Task].
Parameter name: signature
  Source=Microsoft.Owin
  ParamName=signature
  StackTrace:
       at Microsoft.Owin.Builder.AppBuilder.Convert(Type signature, Object app)
       at Microsoft.Owin.Builder.AppBuilder.BuildInternal(Type signature)
       at Microsoft.Owin.Builder.AppBuilder.Build(Type returnType)
       at Microsoft.Owin.Hosting.ServerFactory.ServerFactoryAdapter.Create(IAppBuilder builder)
       at Microsoft.Owin.Hosting.Engine.HostingEngine.StartServer(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)
       at Microsoft.Owin.Hosting.WebApp.Start[TStartup](String url)
       at ConsoleApplication1.Program.Main(String[] args) in e:\EShared\Dev2015\WebAppScottAllen\ConsoleApplication1\ConsoleApplication1\Program.cs:line 16
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, …