title: d3.js Sequence Sunburst __data__ null
body: <p>I am attempting to use a "sequence-sunburst" style d3 visualization for some data that I have. To get started, I decided to simply recreate what is given on the d3 website (<a href="http://bl.ocks.org/kerryrodden/7090426" rel="nofollow noreferrer">http://bl.ocks.org/kerryrodden/7090426</a>).</p>
  
  <p><img src="https://i.stack.imgur.com/mBIXf.gif" alt="enter image description here"></p>
  
  <p>It is here that I have run into some issues:    </p>
  
  <p>On line 85 in "sequence.js", I get the following error:  </p>
  
  <p><code>Cannot read property '__data__' of null</code></p>
  
  <p>Line 85 has the following code:</p>
  
  <p><code>
  totalSize = path.node().__data__.value;
  </code></p>
  
  <p>Again, to get started, I have copied the js and csv verbatim! I have no idea why this does not work. </p>
  
  <p>Further notes:  </p>
  
  <ul>
  <li>I am using the latest version of Chrome</li>
  <li>I am running Chrome set to <code>--allow-file-access-from-files</code></li>
  <li>I am opening my html file (also copied verbatim!) using python's SimpleHTTPServer. The port is correctly referenced.</li>
  </ul>
  
  <p>Help appreciated.</p>