Google ad was preloaded using link preload but not used within a few seconds from the window's load event

Question

When I go to my website no ads are displaying even though I set one at the bottom of the page. It returns error - The resource https://pagead2.googlesyndication.com/pagead/js/r20181107/r20180604/show_ads_impl.js was preloaded using link preload but not used within a few seconds from the window's load event. Please make sure it has an appropriate as value and it is preloaded intentionally. Yes, adblocker is disabled Here's my code for ad:

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<ins class="adsbygoogle"
     style="display:block; text-align:center;"
     data-ad-layout="in-article"
     data-ad-format="fluid"
     data-ad-client="ca-pub-9121789382833091"
     data-ad-slot="8487804504"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>

Answer 1

Are you using Cloudflare? I fixed this by disabling rocket loader on the adsense script.

data-cfasync="false"

I have read multiple times that rocket loader has no negative effect on Adsense, now I am not so convinced.