See my response to JoeMike. I did run it under recovery.
The "8" numbers are Google's numbers. OpenDNS's numbers are the ones I posted.
I believe macOS uses the top number by default and uses any others in order if it doesn't work, which, I guess, is why they come in pairs.
Are you still getting the error?
I think you ought to follow joemike's suggestion and boot into recovery and run First Aid from there.
