You are currently editing the page that shows your latest posts

I am not getting all of a sudden what happened? I changed a theme and then reverted back to my original theme and then I’m getting this message “You are currently editing the page that shows your latest posts.” again and again while creating a new post. I tried to restore an old backup as well but nothing is helping.

I went to this page https://wordpress.org/support/topic/issue-after-wp42-cant-add-new-post-or-pages?replies=6

Can someone tell me what to edit in wp_posts?

EDIT : I shifted the blog to a new server yesterday.