SinglePageApplication 404-Error

[ceremelry]

I am trying to programm a SPA using Upshot.js when i came to a problem.\[code\]upshot.metadata(@(Html.Metadata<...>()));\[/code\]Error: 'System.Web.Mvc.HtmlHelper' does not contain a definition for 'Metadata'I solved this by adding the following line:\[code\]<add namespace="System.Web.Http.Data.Helpers" />\[/code\]in the web.config file.but now there is a 404 error.It does not find the Index.cshtml file.Before i added the "upshot.metadat...." line it worked well.So i can't understand where the problem is.