I am getting a "The operation cant be completed because an unexpected error occurred (error code -50)." error msg whenever I try to copy files from my Mavericks Mac to a Mac OS Extended (Journaled) external HDD that I haven't opened since 2012. I also cannot open my Aperture Library files stored in this external HDD and get this error msg "Aperture cannot access this library. To use this library, make sure its file permissions are set correctly." But when I copy the Aperture Library File from my external HDD to my Mavericks Mac it opens after I updated it to Aperture 3.5.3.