title: Ad stopped showing up. Ad unit failed to fetch. Other ads are working normally but with different code.
body: <p>One ad unit just stopped to work and after trying to generate new code it is still not working. When I use google console it is just showing warning Ad unit failed to fetch. Other 3 ads are working normally. They are inserted before I started to work on this project.</p>
  
  <p>New ad code is generated like
  header</p>
  
  <pre><code>&lt;script type='text/javascript'&gt;
  var googletag = googletag || {};
  googletag.cmd = googletag.cmd || [];
  (function() {
  var gads = document.createElement('script');
  gads.async = true;
  gads.type = 'text/javascript';
  var useSSL = 'https:' == document.location.protocol;
  gads.src = (useSSL ? 'https:' : 'http:') + 
  '//www.googletagservices.com/tag/js/gpt.js';
  var node = document.getElementsByTagName('script')[0];
  node.parentNode.insertBefore(gads, node);
  })();
  &lt;/script&gt;
  
  &lt;script type='text/javascript'&gt;
  googletag.cmd.push(function() {
  googletag.defineSlot('/6000854/R300x250_L', [300, 250], 'div-gpt-ad-1367703773182-0').addService(googletag.pubads());
  googletag.pubads().enableSingleRequest();
  googletag.enableServices();
  });
  &lt;/script&gt;
  </code></pre>
  
  <p>body </p>
  
  <pre><code>    &lt;!-- R300x250_L --&gt;
  &lt;div id='div-gpt-ad-1367703773182-0' style='width:300px; height:250px;'&gt;
  &lt;script type='text/javascript'&gt;
  googletag.cmd.push(function() { googletag.display('div-gpt-ad-1367703773182-0'); });
  &lt;/script&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Old code is generated like 
  header</p>
  
  <pre><code>&lt;script type='text/javascript' src='http://partner.googleadservices.com/gampad/google_service.js'&gt;&lt;/script&gt;
  
      &lt;script type='text/javascript'&gt;
          GS_googleAddAdSenseService("ca-pub-2838961657718357");
          GS_googleEnableAllServices();
      &lt;/script&gt;
  
      &lt;script type='text/javascript'&gt;
          GA_googleAddSlot("ca-pub-2838961657718357", "Top728x90");
          GA_googleAddSlot("ca-pub-2838961657718357", "Right300x250");
          GA_googleAddSlot("ca-pub-2838961657718357", "Right300x250Bottom");
      &lt;/script&gt;
  
      &lt;script type='text/javascript'&gt;
          GA_googleFetchAds();
      &lt;/script&gt;
  </code></pre>
  
  <p>body </p>
  
  <pre><code>&lt;!-- Right300x250Bottom --&gt;
          &lt;script type='text/javascript'&gt;
              GA_googleFillSlot("Right300x250Bottom");
          &lt;/script&gt;
  </code></pre>
  
  <p>Is there maybe conflict because of diferent tags or code 
  NOTE: I am just wordpress front end developer, I don't have access to google DFP services and I am not generating tags or code</p>