Expression of type 'System.Web.Mvc.MvcWebRazorHostFactory' cannot be used for return type 'System.Web.WebPages.Razor.WebRazorHostFactory'

Question

I am getting this error when I try to run a project that I took over.

I assume I have a problem in my web.config, but I don't know what to look for.

Expression of type 'System.Web.Mvc.MvcWebRazorHostFactory' cannot be used for return type 'System.Web.WebPages.Razor.WebRazorHostFactory'

Any suggestions on the same are highly appreciated.

Answer 1

Try to replace line in Web.Config

<host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 

to

<host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 

(set MvcWebRazorHostFactory to version 4.0.0.0)

Answer 2

Set MvcWebRazorHostFactory to version 5.0.0.0 in ALL Views/web.config Under

<system.web.webPages.razor>     <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />