error in ajax json

i am using ajax json to make a login function, and put the web method in asmx file.

in local host its working fine. bt when i upload this one. its every time goes to error part of the ajax and showing error "Undefined".

kindly tell me where is the fault.

code is...

function login() {

$("#btnLogin").attr("disabled", "disabled");

$('.loading_login').show();

var email = document.getElementById("txtLoginEmail").value;

var password = document.getElementById("txtLoginPassword").value;

if (email == "" || password == "") {

alert('Fill up data');

$('.loading_login').hide();

return;

}

else {

/* send the link to fetch details */

var input = email + " " + password; /* detect by space */

$.ajax(

{

type: 'POST',

url: 'ChangePassword.asmx/Login',

data: '{\'inputText\':\'' + input + '\'}',

dataType: 'json',

contentType: 'application/json; charset=utf-8',

success: function (response) {

if (response != null && response.d != null) {

alert('done');

if (response.d != "Success") {

$("#btnLogin").prop("disabled", false);

alert('Wrong email & password !');

$('.loading_login').hide();

}

else {

$("#btnLogin").prop("disabled", false);

window.location = "home.aspx";

alert('welcome');

$('.loading_login').hide();

}

failure: function (response) {

$("#btnLogin").attr("disabled", "disabled");

alert('Sorry! Operation failed.');

alert(response.responseText);

$('.loading_login').hide();

error: function (response) {

$("#btnLogin").attr("disabled", "disabled");

alert('Sorry! Error.');

alert(response.d);

$('.loading_login').hide();

});

}

clearAll();

}