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

http://www.microsoft.com/downloads/en/details.aspx?familyid=AB99342F-5D1A-413D-8319-81DA479AB0D7&displaylang=en

Could not load file or assembly System.Web.Extensions

Problem

Solution

Additional Notes

See Also