Somewhat easy fix, if you have a gameshark laying around (or you can use your PS-X-Change to enter gameshark codes by pushing select (I believe) then put in this code
D00C1998 FF52
800C19A2 1000
D00C42D8 10BA
800C42CE 1000
D00C3B60 E9A0
800C3B5A 1000
D0029344 A4D5
8002933A 1000
D0029364 A4DD
8002935A 1000
And then the game should work
You can find these codes which are called enable codes (that kill the modchip detection) at
http://www.cmgsccc.com/psxi/index.php
(that's the import section)
Enjoy!