That's weird. Just as the message says. It is impossible, because main executable was not found. The only possibility is that the sector table is corrupted or at different location than assumed. Even if just the executable was not found, the game should be full english and of normal size (~4GB) - just the space witdth would be 10.0f then instead of 4.0f. It's not the case, so the sector/size table was corrupted most likely.
Just make sure that the image is a proper one. No headers, 2048 bytes per sector. Redump it using imgburn. Test the image by burning it without patching.
Open the zjs image in hex editor and post a screenshot of what you see at offset 0xba000. It is possible, that there is more than one FF12Int:ZJS versions.
PS. I'm almost sure the image is either corrupted, modified or that it has some headers or is not in 2048B/sector mode. Buy it, borrow from someone, just make sure you did the image using original ps2 disc. I just can't waste the time, if I'm not sure that the image is correct.