So today, I picked up Sonic Adventure DX and Sonic Adventure 2 Battle at Gamestop, used (please no Gamestop bashing).
Now, SA2B seems fully functional (which so far is the only good thing I can say about the game), as does every other gamecube game I own, but SA1DX keeps giving me this error message saying "An error has occured. Please turn off your Gamecube and consult the manual."
I've cleaned the disc millions of times and--even though this happened on two different cubes--cleaned the lens. The disc itself looks to be in good condition.
So what's wrong with it?