A copy of Tony Hawk 2 tells me I have a bad memory card when trying to save

[Diodo]

I've got the same problem too, but, (PREPARE YOURSELF TO HEAR THIS), i've had the same message even if i'm playng with the ORIGINAL version of Tony Hawk 2.
(it tells me I have a bad memory card when trying to save, but only in the CAREER mode, i can save a skatepark made by myself)
The memory card is good and its work for all the game that i have.

Well, i'm from Italy and i have the PAL version of the game, and i'm thinkin that maybe the problem is in the mod-chip that my playstation mount (the series is a 9001)

If anyone had a solution please tell me!!