Problem with red triangle

Ive got a problem come up which i could do with some help on.
ive been updating things on the editor for the new game and now when i try to start a game, i get a red triangle by Italy on the select nations leagues page. The note says that i need a minimum of 22 teams in Serie B but the game has only found 21. Ive checked repeatedly and i have 22 and 22 for next season. In the past when this has occurred (FM14), clearing the cache on steam has solved it. It doesn't now.

anybody got any ideas? Any help would be much appreciated.