Roster problem, urgent!

I tweaked my rookies, edited this and that but didn't make any mistakes. Then I loaded my franchise...all teams were ok...I conducted a trade wih Denver but when browsing the teams in Roster management, Denver's slots are all empty and it says "your team must have 8 players" or something...after loading, Denver does have its players but only after the trade, the slots are empty.

What should I do?

When tweaking the rookies, I have to move them to the rookie pool. After tweaking they have to be moved to their original team again and I moved one rookie to Denver instead of the free agent pool he was in before the tweaking. Denver then had 16 players, which caused the problem.

Now I moved that rookie where he belongs, Denver has 15 players and everything works!