error in assembly when i run app

Question

Could not load file or assembly 'System.Web.Extensions Version=1.0.61025.0 Culture=neutral PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Niradhip Chakraborty · Answer

I also have the same problem. The following solution pave the way for me. 1. Install the latest Asp.NET Ajax 2.Open my web.config in my production server and replace this line by It's the same thing but the PublicKeyToken is in capitals....