Was in Croatia. Had a bunch of new youth players in the squad, some on the field, some on the bench.
Hit continue, and it took me to the screen to assign jersey numbers, hit the auto button, and it assigned them, hit the submit button and it removed them and didn't continue. Assigned the numbers manually, hit continue, and it was fine.
Will see if its the same with this new save I am starting, its in Romania but I will let you know