Facing problem after installing rank math, and setting up instant indexing

I install rank math and instant indexing API, after that, I starting facing some problem of publishing article on my website, I own a blog website, which is juicenews.com.ng, if I want to post a article on my website, it keep telling me publish fail, after I go to my frontend, I will now see the article that told that, publish fail, on my website, the featured image I use in that article will disappear, I starting facing this problem

Since I uninstall yoast and install rank math.