Optical - got it.
I couldn't remove it from the list, but I put it down at the bottoms of the list, which didn't fix the problem.
After my last OS X reinstall the error message didn't show up on the first boot into the OS. It wasn't until running easybeast with system ut's and restarting that the message showed up. Should I be installing easybeast without sys ut and then run sys ut afterwards, and then reboot, rather than running the two concurrently?