I've experienced this now for the third time since I bought the game:
Every time I want to continue any Career Mode game this screen appears. It's in German, but it's telling that my Career Mode save contains leagues to which I've no access anymore. They suggest that I have to buy the Season Ticket or buy content in the FIFA store.
I'm able to play the Career Mode from the beginning. This happens on the first load of the save state.
Best Answer
You're not the only one who's had this happen, but there isn't much out there to explain why this is happening. You might confirm that you didn't somehow start Career Mode with a team that was downloaded from the Creation Centre. One of the things that you get with Season Ticket is below:
If you're using standard leagues, as most of those other people were, then I would guess it is just a bug that, sadly, doesn't seem to have a fix yet.