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ASP.NET Error : Could not load file or assembly ‘System.Web.Extensions, Version=1.0.61025.0 in web.config

Download ASP.NET Ajax 1.0 : http://www.microsoft.com/download/en/details.aspx?id=883 1. Install the latest Asp.NET Ajax 2.Open my web.config in my production server and replace this line <add assembly=”System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″/> by  <add assembly=”System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35″/> It’s the same thing but the PublicKeyToken is in capitals…. Save it and browse to my site and bingo!