[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to… web.config issue

Question

I am getting the following error:

[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuratio

Answer 1

Just adding my two cents to this issue.

I found that the cause of this error for me was that the Views folders web.config was referencing System.Web.WebPages.Razor, Version=2.0.0.0 when everything else was using 3.0.0.0

Seems the nuget-package upgrade didn't account for this folder somehow.