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Simple Ajax returns 200 OK but fires error

Posted By:      Posted Date: October 21, 2010    Points: 0   Category :ASP.Net
Hi, I'm doing a simple ajax example but for some reason it keeps fireing 'error' yet the status returned is 200. Any reasons 'success' is not fired with the simple message? Do I need to reference the json library or is this included with jquery?  

Default.aspx :
<script type="text/javascript" src="scripts/jquery-1.4.3.min.js"></script>  
<script type="text/javascript">      
      function getMessage()
              type: "POST",              
              url: "Default.aspx/sayHello",
              contentType: "application/json; charset=utf-8",
              data: "{}",              
              dataType: "json",
              success: function(response)              
              error: function(response)              
<title>Calling a page method with jQuery</title>  
    <form id="form1" runat="server">                      
        <input type="button" value="get message" onclick="getMess

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