Could not load file or assembly System.Web.Extensions
Problem
You get the following error when running your deployed application:
Could not load file or assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies.
This error usually occurs because the .Net framework 3.5 is not installed on your server.
Solution
Search for "download .NET Framework 3.5 SP1" on the Internet and download and install the framework from the Microsoft web site.
Additional Notes