That page doesnt show it, but something about your club doesnt meet premier league rules. Perhaps you are semi pro?
Its not a bug because 3 teams went up and 3 came down
Tbh, I'd post this on the SI forum, see what they say..
I'm pretty sure the game automatically makes your board upgrade the necessary facilities for promotion..
Also, I don't think semi-pro clubs are even allowed in the Football League.