Jquery-Ajax problems in MVC4 Application using VS-2010

Question

Hi,

     We are developing a MVC4 application .We are getting "jQuery undefined error" whenever we are rendering @Scripts.Render("~/bundles/jqueryval") in the master layout page.

             jqueryval bundle includes jquery.validate.Unobtrusive.js,

                                                      jquery.validate.js,

                                                      jquery.unobtrusive-ajax.js.

whenever a view is loading its throwing "jQuery undefined error" ..

googled and tried many ways...but it's not working....

New to MVC please help....struggling since 2 days..