Sys.ArgumentUndefinedException: Value cannot be undefined

<asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server">

<script src="../../Scripts/jquery-1.2.6.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftAjax.debug.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcAjax.debug.js" type="text/javascript"></script>

<script type="text/javascript">
    var myView;

    $(pageLoad);

    function pageLoad() {
        myView = $create(Sys.UI.DataView, {}, {}, {}, $get("ajaxResult"));
        $("#callAjaxButton").click(callActionMethod);
    }

    function callActionMethod() {
        $.getJSON("/Home/GetCategories", bindData);
    }

    function bindData(data) {
        myView.set_data(data);
    }

</script>

<input type="button" id="callAjaxButton" value="ajaxCall" />

<div id="ajaxResult"></div>

</asp:Content>

<script src="../../Scripts/jquery-1.2.6.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftAjax.debug.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcAjax.debug.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftAjaxTemplates.debug.js" type="text/javascript"></script>

<script type="text/javascript">
    var myView;

    Sys.Application.add_init(pageLoad);

    function pageLoad() {
        myView = $create(Sys.UI.DataView, {}, {}, {}, $get("ajaxResult"));
        $("#callAjaxButton").click(callActionMethod);
    }

    function callActionMethod() {
        $.getJSON("/Home/GetCategories", bindData);
    }

    function bindData(data) {
        myView.set_data(data);
    }

</script>

<input type="button" id="callAjaxButton" value="ajaxCall" />
<div id="ajaxResult"></div>