A-6 Japanese PS2 Game

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Anyone have any ideas. My roommate and I both have modded PS2 and PS3 consoles and regular play Japanese import games. Recently I snagged a copy of A6 from Hit-Japan and it will not play in \either of our units. I get an error message stating to please insert a PS2 or PS3 game in to the unit. The PS3 has some sort of mod chip (Squid is the cracker) and we have a remove lid and swap disc setup for the PS2. Any ideas?