My minecraft world is missing from PS3?

I world I've spent three weeks building on PS3 has vanished this morning. I looked online, most are saying it because the file has corrupted. But there's no file at all.

It's as if I never played the game at all.

Is this a known fault with no fix, or is there a fix. The fixes I've seen are all based around modifying the corrupt file. Not helpful as there NOTHING to work with on my PS3

Same happened to me, anyone have ideas on how to fix it?