Not all games work discless. Some games require an original game disk in the drive.
Try the BD Mirror option in mM, if this doesn't work for this game, you're gonna have to emulate your disk drive on a USB flash drive. But you need Rebug CFW in DEX mode to be able to do that.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!