[QUOTE=Mehtab] But the AJAX.LastData doesn't returning any data.[/QUOTE]
If it doesn't appear to be returning data then you may want to check the page that is suppose to be returning the data. If the page is throwing an error or returning blanks, then yes, the AJAX.LastData will not return anything.
If the page is returning or showing data, then it may be that the events you've set up in your game is not setting or assigning the AJAX.LastData payload to your target object. For example, a text box that keeps track of scores or users.