title: C3JS - Cannot read property 'category10' of undefined
body: <p>I tried this c3.js code from jsfiddle (<a href="https://jsfiddle.net/varunoberoi/mcd6ucge">https://jsfiddle.net/varunoberoi/mcd6ucge</a>) but it doesn't seem to work in my localhost.</p>
  
  <p>I'm using uniserver as my server. I copy-paste everything but it's not working. </p>
  
  <pre><code>&lt;html&gt;
      &lt;head&gt;
          &lt;!-- CSS --&gt;
          &lt;link href="css/c3.css" rel="stylesheet" type="text/css" /&gt;
  
          &lt;!-- JAVASCRIPT --&gt;
          &lt;script src="js/d3.min.js" type="text/javascript"&gt;&lt;/script&gt;
          &lt;script src="js/c3.js" type="text/javascript"&gt;&lt;/script&gt;
  
          &lt;script type="text/javascript"&gt;
              window.onload=function(){
                  var chart = c3.generate({
                      data: {
                          columns: [
                              ['data1', 300, 350, 300, 0, 0, 0],
                              ['data2', 130, 100, 140, 200, 150, 50]
                          ],
                          types: {
                              data1: 'area',
                              data2: 'area-spline'
                          }
                      },
                      axis: {
                          y: {
                              padding: {bottom: 0},
                              min: 0
                          },
                          x: {
                              padding: {left: 0},
                              min: 0,
                              show: false
                          }
                      }
  
                  });
              }
          &lt;/script&gt;
      &lt;/head&gt;
      &lt;body&gt;
          &lt;div id="chart"&gt;&lt;/div&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>What I got when I check the Developer Tools' console is this:</p>
  
  <pre><code>c3.js:5783 Uncaught TypeError: Cannot read property 'category10' of undefined
  </code></pre>
  
  <p>I tried different versions of c3.js but nothing. It's weird because it's working in jsfiddle and not in my local.</p>