title: Exception after installing ASP.NET Route Debugger
body: <p>i am running VS 2013 and i just installed the <a href="http://blogs.msdn.com/b/webdev/archive/2013/04/04/debugging-asp-net-web-api-with-route-debugger.aspx" rel="nofollow noreferrer">ASP.NET Route Debugger</a>. when I try to run it by browsing to localhost:xxx/rd i get the following error:</p>
  
  <pre><code>[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'. Type B originates from 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Users\joshua\AppData\Local\Temp\Temporary ASP.NET Files\root\84448590\ee78b185\assembly\dl3\776eeced\61921913_e997ce01\System.Web.WebPages.Razor.dll'.
  
  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.InvalidCastException: [A]System.
  Web.WebPages.Razor.Configuration.HostSection cannot be cast
  to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'. Type B originates from 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Users\joshua\AppData\Local\Temp\Temporary ASP.NET 
  Files\root\84448590\ee78b185\assembly\dl3\776eeced\61921913_e997ce01\System.Web.WebPages.Razor.dll'.
  </code></pre>
  
  <p>Stack Trace:</p>
  
  <pre><code>[InvalidCastException: [A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'. Type B originates from 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Users\joshua\AppData\Local\Temp\Temporary ASP.NET Files\root\84448590\ee78b185\assembly\dl3\776eeced\61921913_e997ce01\System.Web.WebPages.Razor.dll'.]
     System.Web.WebPages.Razor.WebRazorHostFactory.GetRazorSection(String virtualPath) +151
     System.Web.WebPages.Razor.WebRazorHostFactory.CreateHostFromConfig(String virtualPath, String physicalPath) +209
     System.Web.WebPages.Razor.WebRazorHostFactory.CreateHostFromConfig(String virtualPath) +46
     System.Web.WebPages.Razor.RazorBuildProvider.GetHostFromConfig() +58
     System.Web.WebPages.Razor.RazorBuildProvider.CreateHost() +62
     System.Web.WebPages.Razor.RazorBuildProvider.get_Host() +65
     System.Web.WebPages.Razor.RazorBuildProvider.EnsureGeneratedCode() +83
     System.Web.WebPages.Razor.RazorBuildProvider.get_CodeCompilerType() +54
     System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider) +59
     System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders() +209
     System.Web.Compilation.BuildProvidersCompiler.PerformBuild() +15
     System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) +9949713
     System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) +299
     System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) +103
     System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound) +165
     System.Web.Compilation.BuildManager.GetCompiledType(VirtualPath virtualPath) +10
     System.Web.Compilation.BuildManager.GetCompiledType(String virtualPath) +28
     System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.GetCompiledType(String virtualPath) +47
     System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +175
     System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +480
     System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +50
     System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +123
     System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +582
     System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +115
     System.Web.Mvc.Async.&lt;&gt;c__DisplayClass28.&lt;BeginInvokeAction&gt;b__19() +321
     System.Web.Mvc.Async.&lt;&gt;c__DisplayClass1e.&lt;BeginInvokeAction&gt;b__1b(IAsyncResult asyncResult) +184
     System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +53
     System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +140
     System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +63
     System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +50
     System.Web.Mvc.Controller.&lt;BeginExecuteCore&gt;b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +45
     System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +81
     System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +146
     System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +66
     System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +50
     System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +50
     System.Web.Mvc.Controller.&lt;BeginExecute&gt;b__15(IAsyncResult asyncResult, Controller controller) +50
     System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
     System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +146
     System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +66
     System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +50
     System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +50
     System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +50
     System.Web.Mvc.MvcHandler.&lt;BeginProcessRequest&gt;b__4(IAsyncResult asyncResult, ProcessRequestState innerState) +45
     System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +81
     System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +146
     System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +66
     System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +50
     System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +50
     System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +49
     System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9631512
     System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +155
  </code></pre>
  
  <p>i tried the solution mentioned <a href="https://stackoverflow.com/a/9404019/411094">here</a> but it did not work. i tried making it version 2 and 3.</p>