Uncaught ReferenceError: FixedColumns is not defined-Collection of common programming errors

I’m following the examples to use FixedColumns.

var oTable4 = $('#example').dataTable( {
            "sScrollY": "300px",
            "sScrollX": "100%",
            "sScrollXInner": "150%",
            "bScrollCollapse": true,
            "bPaginate": false
        } );
        new FixedColumns( oTable4 );

I get the following error which means I’ve made some error initializing it…

Uncaught ReferenceError: FixedColumns is not defined 

Is FixedColumn a seperate plugin?

I’m using jQuery 1.9.1.