                <p>
                  The chunk syntax is invalid.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="literal">bad_chunk_extension</code>
                </p>
              </td>
<td>
                <p>
                  The chunk extension is invalid.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="literal">bad_obs_fold</code>
                </p>
              </td>
<td>
  