Getting "asp.net ajax client-side framework failed to load" error message

I am using AJAX controls in my ASP.net application, and when i run the application locally, everything works fine.

Now, I deployed the app to one of testing servers and it looks like all the AJAX enabled controls are not working at all and I can see that there is an error while the page(where I use AJAX controls) is loading.

The error I am getting is "asp.net ajax client-side framework failed to load".

I googled it and it loo开发者_StackOverflow社区ks like I have to install the ASP.net AJAX extension on the server side. But, how do you install the extension on the server? Isn't it just a dll? I already included the dll in the bin folder.

Thanks.