oSettings is null - But this is almost exactly example code?

Hi all, I might be seriously missing something here but the following code is almost exactly the same as the example code at http://datatables.net/release-datatables/examples/api/select_single_row.html but I'm getting oSettings is null at jquery.dataTables.js line 4979.

The code breaks when I try to do

oTable.$('tr.row_selected').removeClass('row_selected');

I'm pretty sure sure I'm using the latest version of everything?
Here follows my full code, its very basic.

var oTable;
$(document).ready(function(){
	$('#demo').html('<table cellpadding="0" cellspacing="0" border="0" class="display" id="example"></table>');
	
	$('#example').dataTable( {
        "bPaginate": true,
        "bLengthChange": false,
        "bFilter": false,
        "bSort": false,
        "bInfo": false,
        "bAutoWidth": false,
        "bServerSide": false,
        
	    "aaData": [
        /* Reduced data set */
	        [ "eng","English" , "This is a message" ],
	        [ "afr","Afrikaans" , "Hierdie is 'n boodskap" ],
	    ],
	    "aoColumns": [
	        { "sTitle": "Language code" },
	        { "sTitle": "Language" },
	        { "sTitle": "Display string" },
	    ]
	} );
	
	
    /* Add a click handler to the rows - this could be used as a callback */
    $("#example tbody tr").click( function( e ) {
        if ( $(this).hasClass('row_selected') ) {
            $(this).removeClass('row_selected');
        }
        else {
        	oTable.$('tr.row_selected').removeClass('row_selected');
            $(this).addClass('row_selected');
       }
    });
	
	oTable = $('example').dataTable();
});
	
/* Get the rows which are currently selected */
function fnGetSelected( oTableLocal )
{
    return oTableLocal.$('tr.row_selected');
}

Thanks