I got that too. Mine was working fine for a long time, then I decided to dual-boot my computer. I tried messing with one of my partitions on my storage drive, and all of a sudden I could no longer access it. I ended up typing in a bunch of commands based on an article online, and I was able to fix it. However, ever since then, I get that error. It's annoying, but hasn't impacted anything other than my start up time. Wish I had a solution for you. I searched, and different people had mixed results. Is it messing anything else up for you?