JQuery :: Datatables - Server Side Processing PHP

I try this sample [URL], where data is procesed on server. I prepare tables in DB and data. and nothing isn't displayed in datable? Then I create same server_prcosing php and I checked syntax from php it was OK same as json, but jquery.datable did not process any data on screen.
source:

style type="text/css" title="currentStyle">
@import "css/demo_page.css";
@import "css/demo_table_jui.css";
@import "css/smoothness/jquery-ui-1.7.2.custom.css";
</style>
<script src="lib/jquery.dataTables.js" type="text/javascript" language="javascript"></script>
$().ready(function() {...

$("#example").dataTable({
"bProcessing": true,
"bServerSide": true,
"bJQueryUI": true,
"sPaginationType": "full_numbers",
"sAjaxSource": "SearchForms/server_processing.php"
});
});