Haven't been able to log into ultimate team the last 3 days.

Hey baileythehef​,

Please try deleting your active squad in the Companion app or the Web app, set up a new empty squad as your active one, then return to your platform and try accessing UT again. Sometimes refreshing the squad data resolves these kinds of errors.

It might also help to delete the corrupted file by following this guide and then restart the game.

If this error persists for you afterward, please also try connecting to your platform using a different connection; it might help isolate the problem. 

Let me know how it goes.