Server Error in '/' Application.

A route named 'HelpPage_Default' is already in the route collection. Route names must be unique.
Parameter name: name

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentException: A route named 'HelpPage_Default' is already in the route collection. Route names must be unique.
Parameter name: name
Source Error:  
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[ArgumentException: A route named 'HelpPage_Default' is already in the route collection. Route names must be unique.
Parameter name: name]
   System.Web.Routing.RouteCollection.Add(String name,RouteBase item) +3713577
   System.Web.Mvc.RouteCollectionExtensions.MapRoute(RouteCollection routes,String name,String url,Object defaults,Object constraints,String[] namespaces) +350
   System.Web.Mvc.AreaRegistrationContext.MapRoute(String name,String[] namespaces) +95
   XbimServer.Areas.HelpPage.HelpPageAreaRegistration.RegisterArea(AreaRegistrationContext context) +174
   System.Web.Mvc.AreaRegistration.RegisterAllAreas(RouteCollection routes,IBuildManager buildManager,Object state) +323
   BimServer.WebApiApplication.Application_Start() +23

[HttpException (0x80004005): A route named 'HelpPage_Default' is already in the route collection. Route names must be unique.
Parameter name: name]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context,HttpApplication app) +12600317
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext,HttpContext context,MethodInfo[] handlers) +175
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state,MethodInfo[] handlers,IntPtr appContext,HttpContext context) +304
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext,HttpContext context) +404
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +475

[HttpException (0x80004005): A route named 'HelpPage_Default' is already in the route collection. Route names must be unique.
Parameter name: name]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +12617364
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +159
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr,HttpContext context) +12456981

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34212

这是我在Global.asax.cs中设置的：

protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }

我的RouteConfig.cs：

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",url: "{controller}/{action}/{id}",defaults: new { controller = "Home",action = "Index",id = UrlParameter.Optional }
            );
        }

和我的WebApiConfig.cs：

config.MapHttpAttributeRoutes();

    config.Routes.MapHttpRoute(
        name: "DefaultApi",routeTemplate: "api/{controller}/{id}",defaults: new { id = RouteParameter.Optional }
    );

我也对我的web.config文件进行了以下更改：

<system.webServer>
    <modules>
      <remove name="WebDAVModule" />
    </modules>
    <handlers>
      <remove name="WebDAV" />
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer>