I cannot copy my Aperture library from one drive to another
I have tried this 5 or 6 times now. I have done all three steps in the First Aid section in Aperture. Every time the transfer begins fine and then hangs up with 2 hours remaining and about 272 GB of 700+ GB total having been transferred. I then get this error screen:
I am attempting to transfer from one internal drive to another.
Mac Pro, OS X Yosemite (10.10), 2.66 Ghz Quad Core