macos - Can't create user on Mac with dscl command

I was trying to create a postgres user using the command

sudo dscl . -create /Users/postgres

But failed. Got the following output

create: Invalid Path

 DS Error: -14009 (eDSUnknownNodeName)

I had used dscl create and dscl delete commands prior to this failure.

sudo dscl . -create /Users/postgres
sudo dscl . -delete /Users/postgres

I think somehow I screwed up the system. How can I fix it?

Answer

Finally figured out that there is was one plist file left. Had to delete

/private/var/db/dslocal/nodes/Default/users/postgres.plist

then creating user was successful.