I'm getting the same error. I have both the physical cartridge and an installed cia from the dumped card.
I get this error when I try to start up a new save or even sit on the intro title card as well as after about a minute of messing around in the game.
I have tried everything from upgrading...
yo guys the sonic x shadow generations trailer dropped today, and shadow just straight up decided, and i hate (love) to bring this dead meme up, but, it's morbin time