jquery - Post data into database via ajax. displays 501 internal error -

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i trying post data asp.net webform database. have in asp.net service (shoppingcart_service.asmx)

 [webmethod] //          public void registersubscriber(string email)         {             new onlineshoptableadapters.newslettersubscriberstableadapter().insert(email, datetime.now);      //database code           }

this html

  <input type="button" onclick="savedata()" id="btnsave" value="subscribe"  >

this ajax code, put in file called apps.js , linked page

//updated ! function savedata() {

 function savedata() {      var subscriberemail = $("#email").val();     $.ajax({         type: "post",         url: "shoppingcart_service.asmx/registersubscriber",         data: '{"email":"' + subscriberemail + '"}',         contenttype: "application/json; charset=utf-8",         datatype: "json",         success: function (response) {             alert(response.status + ' ' + response.statustext);         },         error: function (request, status, error) {          }      });  }

but value doesn't posted database consider error got in chrome's console, after clicking subscribe button

error-snapshot

i have done same thing in 1 of projects , works well..the difference can see webmethods return string/bool values , webservice class has scriptservice attribute.

see below:

 [system.web.script.services.scriptservice]  public class ajaxpost : webservice  {      [webmethod]      public string callback(string txbfirstname)      {      }  }

and script side is:

    $.ajax({         type: "post",         url: "/services/ajaxpost.asmx/callback",         data: '{"txbfirstname":"' + txbfirstname + '"}',         contenttype: "application/json; charset=utf-8",         datatype: "json",         success: function(result) {          },         error: function(request, status, error) {          }      });

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