Adsense Ads Not Displaying

Comment on SEO AdSense WordPress Theme by Bud Sailor.

Hopefully last question – can you figure out why my ads are not displaying? I created 3 new responsive ad units and pasted the code respectively into the appropriate box on the Adsense Options page as follows:

<!-- stradunit1 -->
<ins class="adsbygoogle stradunit1"
     style="display:inline-block"
     data-ad-client="ca-pub-0000000000"
     data-ad-slot="0000000000"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

The only thing that changed between the 3 was the title and the data-ad-slot number. Then I selected “Add JS Script to Footer ON”. Is this correct – if not why please?

Thanks Dave