[jvapocalypto]

I had this problem in madden 12, because I had too many players on the roster (maximum is 2971), so i removed some and the roster worked.
Also once a roster save is saved with too many players, it wont work even if you remove them. You need to start with a fresh, working roster save file such as a default, and then save your new roster edit over it.
Hope this answered you question from 7 years ago :')