I am starting to feel stupid....
Every time i try to upgrade using this link: https://docs.nodebb.org/configuring/upgrade/
ends in errors!
There is update 1.18.1 to 1.18.2 so not between branches.
I stop the forum. CD to my nodebb directory.
ON that page it clearly says
$ git fetch
$ git reset --hard origin/v1.12.x # Replace v1.12.x with the branch name!
I get a return of
fatal: ambiguous argument 'origin/v1.18.2x': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'