The type 'Expression<>' is defined in an assembly that is not referenced

Question

In ASP.NET MVC 4.5.2 Framework.

after typing

@Html.LabelFor()
or 
@Html.EditorFor()

in view

I\'m getting Error: The

Answer 1

Add the following to Web.config (in root). I tried absolutely everything of earlier suggestions and nothing worked until I found the below. Hope it will save time for someone else.

I use targetFramework="4.6.1", but change it to the version you use if different.