mistake: "early!"

I wanted to create a topic on the blog "I'm smart." I went to the blog page, clicked on the "Join the blog" button, after joining clicked on "Add Habratopik", and here’s what Habrahabr tells me: I

tried the same thing with the blog "Errors on the site", it also turns out.
ps. created a topic in a personal blog, because I can’t get anywhere else :(
pps. I hope this is not due to my low karma = 4? There are almost no restrictions in “I’m smart” ...