Uncaught TypeError: Cannot read property 'oTableTools' of null

I am trying to get TableTools to run with DataTables 1.9.1 and TableTools 2.1.4

I have included the two js files, css and pointed the sSwfPath to the path of the swf file but nothing is showing whatsoever. When I view source I am not finding anything being added to the page at all so clearly something is up.

When I look in the console it shows only one error:

Uncaught TypeError: Cannot read property 'oTableTools' of null TableTools.js:2456

and this line contains:

var oOpts = typeof oDTSettings.oInit.oTableTools != 'undefined' ?

Might this be the cause of the issue? If not, what else can I check to see why it won't show?

Thanks