Could not load file or assembly 'System.Web.Mvc'

If you inherit old sitecore site version 6.5 or version 7.1 you are more likely to get a error that iis is complaining about finding System.Web.Mvc assembly.

<add assembly="System.Web.Mvc, Version=4.0.0.0, Culture=neutral,PublicKeyToken=31BF3856AD364E35" />

You can download MVC 4 dlls from following link and install it on your local machine https://www.microsoft.com/en-us/download/confirmation.aspx?id=30683 

 I recommend to add required dlls later to solution and then set your dll to copy local.

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