title: Sort by two columns with dataTables (Cannot read property 'sType' of undefined)
body: <p>I'm using <a href="http://datatables.net" rel="nofollow">dataTables plugin</a> to deal with the sorting of columns.</p>
  
  <p>Trying to apply the <a href="https://datatables.net/examples/basic_init/multi_col_sort.html" rel="nofollow">multi-column ordering</a> I'm getting the following error in the console:</p>
  
  <blockquote>
    <p>Uncaught TypeError: Cannot read property 'sType' of undefined </p>
  </blockquote>
  
  <p>As the documentation is not very explanatory in this regard and doesn't contain too many examples for this feature, I don't know where the problem is. </p>
  
  <p><a href="http://jsfiddle.net/L5gbck06/" rel="nofollow">Reproduction of the problem</a></p>
  
  <pre><code>$('#demo').DataTable({
      paging: false,
      ordering: true,
      columnDefs: [{
          orderData: [[0, 'asc'],[1, 'asc']],
          targets: [1]
      }]
  });
  </code></pre>