Purchased a new MBP because 2007 MBP died. Time Machine Backup to new MBP, and most things work. Some programs no longer supported, but no big deal. 2TB HDD connected to Airport Extreme. Have always been able to transfer plans from work wirelessly easily. Just drag and they copy. Tried today from new MBP, and get following error. "The operation can't be completed because an unexpected error occurred (error code -50)." No unusual characters, no change in HDD settings from old MBP to new. Can't really transfer data to another drive, as this one is about half full (1TB) and I don't have anything with that much available space. I thought it may be permissions error, but I can pull from the HDD no problem, just can't copy. Any help would be greatly appreciated.