Could not load file or assembly System.Web.WebPages.Razor, , Version=3.0.0.0 or one of its dependencies

Question

I am using MVC 5, WCF and Unity framework in my application.

I am getting below error when I run WCF service:

Server Error in \'/\' Application.

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Answer 1

Be sure that your project targets .net 4.5, that all references are valid and that web AspNet.WebPages.* are in the bin (Release/Debug) folder.

You may also try to reinstall Microsoft.AspNet.WebPages nuget packages using this command in the package manager console

> Update-Package –reinstall Microsoft.AspNet.WebPages 

Answer 2

I was encountering the exact error here (among a couple other missing reference errors) on my Win10 x64 system. My issue was (I believe), was caused by uninstalling something from add/remove that ripped out other dlls.

After scouring the internet for a solution, what finally worked for me was the answer here: https://stackoverflow.com/a/27785999/692124

Download and install Web Pages Version 2

Answer 3

I had same issue where WCF was showing error of unrelated MVC assembly (I have multiple MVC projects in solution which are using System.Web.WebPages.Razor, Version=3.0.0.0). I installed Microsoft.AspNet.WebPages package in the WCF project , ran WCF proj and It worked. After that I had uninstalled all Microsoft.AspNet.WebPages related packages. It worked fine.