Clearing a table and re-initialising

I am starting to get frustrated... Banging my head on the desk. I just can't figure out why this keeps throwing an error.

I was initialising my table:

var table = $('#table').DataTable({

    data: dataSet,
    columns: [
        { 
            "className":      'details-control',
            "orderable":      false,
            "data":           null,
            "defaultContent": ''
        },
        { title: "RO Number" },
        { title: "Dept" },
        { title: "Age" },
        { title: "Age Cat" },
        { title: "RO Advisor" },
        { title: "RO Sales Amount" }
    ]
});

This was fine - What I want is to re-initialise within page, so I added the following few lines prior which is what the documentation advised but I can't get to work - I want to get the table instance, clear it, then re-initialise it but it is proving way beyond my skillset...

var table = $('#table').DataTable();
table.clear().draw();

var table = $('#table').DataTable({

    data: dataSet,
    columns: [
        { 
            "className":      'details-control',
            "orderable":      false,
            "data":           null,
            "defaultContent": ''
        },
        { title: "RO Number" },
        { title: "Dept" },
        { title: "Age" },
        { title: "Age Cat" },
        { title: "RO Advisor" },
        { title: "RO Sales Amount" }
    ]
});

Which results in: Uncaught TypeError: Cannot read property 'aDataSort' of undefined

I then tried

var table = $('#table').DataTable();
table.destroy();

Same error: Uncaught TypeError: Cannot read property 'aDataSort' of undefined

I then tried to specifically tell it to grab the instance:

var table = $('#openro-data').DataTable( { retrieve: true } );

Same error: Uncaught TypeError: Cannot read property 'aDataSort' of undefined

Why can't i grab the table instance, destroy it, and re-initialise it?
The dataSet is a javascript array within the page so should be easily accessed...