There are two possibilities:

1) You have at least one young player assigned in the roster of a team In the fifa.db all the young players must be free agent.

2) There is an error in the design of a tournament that becomes important only the second year for example

there is an error in the tournament of an international cup like Champions' League or Europa League (or their FIFA equivalence)

there is an error in the promotion and relegation rules between first and second league, if your Country supports more then one league.