Problem with web.config after upgrade between MVC 4 and MVC 5, 5.2.0.0 and 3.0.0.0 and missing intellisense in Visual Studio./blogs/Eric-Pettersson/Dates/2014/10/problem-with-web-config-after-upgrade-between-mvc-4-and-mvc-5-5-2-0-0-and-3-0-0-0-and-missing-intellisense-in-visual-studio/Optimizely World