fnfilter not working on site

Hello all, thank you for your help in advance. Trying to filter content of a column based on first letter but can't seem to get it working on my local machine even though it works on http://live.datatables.net/

code below

var oTable = $('#example').dataTable();
var Letter = "C"
$('#setV').click( function () {
oTable.fnFilter('^' + Letter, 0, true, true);
} );

Thanks again in advance.