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May 09, 2012 04:34 PM|LINK
refer to my post above, I could say, we got same problem.
1. open webmatrix and your site
2. click 'RUN' then you get your site running in the browser.
3. change the URL http://localhost:28760/ TO http://localhost:28760/_Admin/ then press ENTER (if your have not visited _admin page before, you will be ask to set a password )
4. Reinstall the ASP.NET Web Helpers Library 1.15
5. Magic!!! it works
still magic. I cannot understand why throw Webmatrix NuGet Gallery to reinstall the helper package not show same result.
hope this will help your works.