Is this a region thing? I'm using the built in PSX player and placing all games like so: PSP/Game/Game title/EBOOT.PBP

Downloaded three games that work perfectly. The fourth one looks fine on the game select but when I press it it just says "Game cannot be started, Data is corrupted. "

It came from the same site as all the others too. I thought maybe it's a region lock but I really don't know.

Any help please I just don't understand it. It looks and seems fine but won't start when pressed on.