Can't rewind an episode !!

Hi there, I had a problem with my saving files. I need 1 last achievements and to obtain it, I need to rewind the episode in the bar. But when I try to rewind it, it say you need to do a copy. I click on ok and then it try to look over my save files but it keep loading an nothing is showing. I let it load for 15 min and still nothing. It does that everytime I tried to see my all saves files. What should I do ??

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