Download !new!: System.web.helpers 2.0.0.0 Dll
The assembly isn't installed in the Global Assembly Cache (GAC) of the server.
Are you running into this error on a or a production server ? system.web.helpers 2.0.0.0 dll download
Run the following command: Install-Package Microsoft.AspNet.WebPages -Version 2.0.20710.0 (Note: This version of the package contains the 2.0.0.0 assembly.) 2. Microsoft ASP.NET MVC 4 Installation The assembly isn't installed in the Global Assembly
Ensure your project is targeting .NET Framework 4.0 or higher, as version 2.0.0.0 of the helpers library requires it. system.web.helpers 2.0.0.0 dll download