Superstar Showdown

For the past couple of days everytime I load up Superstsr Showdown I get an error and get booted back to the showdown menu, I can play any other mode without issue, one time I just went to the restroom and I had an overlay saying there was an error, when I came back I was in a game with that same overlay still there, so that means I can load into a game but that overlay kicks me out no matter what I do