title: Trying to create a stacked bar chart, but cannot drag "Measure Names" to Color
body: <p>I'm a first time user and every tutorial starts off with this step.  My data looks like</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>dept</th>
  <th>sold</th>
  <th>unsold</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>A</td>
  <td>4</td>
  <td>6</td>
  </tr>
  <tr>
  <td>B</td>
  <td>8</td>
  <td>9</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>I am using the free trial on their website if that makes a difference</p>