Created Unassigned: ASP.NET 4.5: 'MsAjaxBundle' is not a valid script name. the name must end in '.js' [27444]

I installed through NuGet the latest version of Ajax Control Toolkit (June 2013 Release).
After coding how is indicate in https://ajaxcontroltoolkit.codeplex.com/ page, I received this error:

'MsAjaxBundle' is not a valid script name. the name must end in '.js'

I googled this error and finally I find the way thanks to Stephen Walther page site http://stephenwalther.com/archive/2012/09/20/september-2012-release-of-the-ajax-control-toolkit.

I finally solved the issue through this step:
1. Insert this line code in Site.master:
<%@ Register TagPrefix="ajax" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" %>
2. Apply the changes indicate into Stephen's site
3. Insert however in Default.aspx (that has Site.Master like MasterPage) this line code:
<%@ Register TagPrefix="ajax" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" %>
4. Insert the control to use

Apologize form my English, but I hope this will be of help someone ;P