title: Google SDTT error: "The review has no reviewed item specified."
body: <p>I checked my website's Rich Snippets in the Google Rich Snippets Tool, and it had an error:</p>
  
  <blockquote>
    <p>The review has no reviewed item specified.</p>
    
    <p><img src="https://i.stack.imgur.com/3nURL.png" alt="Picture of the error Google shows"></p>
  </blockquote>
  
  <p>How do I fix it? </p>
  
  <p>The code is:</p>
  
  <pre><code>&lt;div itemprop="aggregateRating" itemscope="" itemtype="http://schema.org/AggregateRating"&gt;
    &lt;span itemprop="ratingValue"&gt;5&lt;/span&gt; stars - based on &lt;span itemprop="reviewCount"&gt;21&lt;/span&gt; reviews
  &lt;/div&gt;
  </code></pre>