^^^ No battery in Snowboards Kids 2 (iirc).
Turn the system on with the cart in, pull the cart out, try again. It was likely corrupted by something similar having been done to it at some point (not saying by you), and your best chance is to try and wipe the save file out. May try rapid power on-off cycles too.
Now, I don't KNOW this to be a perfect fix, but it's about all I can think of to try and solve the problem since it's not a battery backup. So try at your own risk.