Corrupt save file. It's mentioned in this thread: http://answers.ea.com/t5/Battlefield-4/Known-Battlefield-4-Issues-and-Next-Steps-Updated-Nov-14/m-p/1767613#M31115
"Single Player Save File Corrupted
INVESTIGATING
We are still investigating the issue of single player save files being corrupted for some players. If you have experienced this problem, please describe below the steps leading up to the save file being corrupted, your platform (PC, PS3 or X360), and when the issue occurred."
Some folks have reported success removing the save file and starting over and though it's not an optimal solution, it appears to allow you to play the game.
I also had this problem, The way I "fixed" the problem was after the game loaded and you press the Options button, spam X so the game with accept the Terms Of Service and go to the multiplayer screen. Hope this works for you as well
