Yesterday I installed an update (Visual Studio 2013 Update 2) to Visual Studio 2013 and since then it has not worked properly.
The update was taking quite a long ti
Go to the path in the message error: At my case is C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config
And rename the file web.config to web_old.config.
At Solution Explorer try reload your project again.
Good look!