Please try to re-save the post that shows this error. Regarding this issue, your post on Facebook Instant article will still work fine. This notice occurs because <div class=”jeg_ad jeg_ad_article jnews_content_inline_ads”> can’t render on Facebook Instant article and this error being cached in the Facebook Instant cache data. You just need to re-save your post and the problem will not occur.
Let us know if you still getting problem in there.