problem:
Could not load file or assembly 'System.Web.Extensions, Version = 1.0.61025.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35'
solution:
Install IIS features .net 3.5
Could not load file or assembly 'System.Web.Extensions, Version = 1.0.61025.0, Culture = neutral, PublicKeyToken = 31bf3856ad364e35'
Install IIS features .net 3.5