Time Machine error 2 HD disks with the same name
Time Machine fails to back up. OS is High Sierra. Error messages says there are 2 disks with the same name. If you go to disk doctor you find the Macintosh HD and Macintosh HD Data only, but if you go to Time Machine preferences you see that disks appear duplicate. (See screen shot). Haven't been able to find on the web any answer to this. Onyx, Disk Warrior also see only one disk. There is no "delete" from the Time Machine preference window. How do I correct this? Thks
MacBook Air 13", macOS 10.13