Ajax Control Toolkid2012 is giving as system.web.Script error

Hi,

I'm started to use the Ajax Control Toolkid 2012 in my existing website.

Bud when i build my website it was giving the error that the reference to the old system.web.extensions was to old(I was using 3.5 reference), so I have updated the old to the new System.Web.Extensions 4.0.0.0.

Bud now when i want to build the website, it is returning the error that NameSpace Script and ApplicationService does not exists in the namespace system.web (are you missing a assembly reference?)

Does any body knows how i can solve this?

(I'm running the website in visual studio 2010)

Best regards,

Mark