title: Advanced Custom Fields - Wordpress
body: <p>While using the <em>Custom Fields Plugin</em>, I cannot get it to return any data.</p>
  
  <p>I have created a field group called <code>book_cover_thumbnail</code> which has one post linked to it. Can anyone see why the code below would not work?</p>
  
  <pre><code>&lt;img src="&lt;?php get_field('book_cover_thumbnail');?&gt;" /&gt;
  </code></pre>
  
  <p>I get no errors at all, no white space.</p>