git merge and got this error "does not point to a commit"

Question

I forked a repo from github.com, and also had set the upstream remote. Below is my repo

[ Leezhm LIZHM ~/Developments/OF_GIT ] git remote -v
origin  git@github.com:leezhm/openFrameworks.git (fetch)
origin  git@github.com:leezhm/openFrameworks.git (push)
upstream    https://github.com/openframeworks/openFrameworks.git (fetch)
upstream    https://github.com/openframeworks/openFrameworks.git (push)

when I used this command

git fetch upstream develop
git merge upstream/mac8

It always got the following error

fatal: 'upstream/mac8' does not point to a commit

Answer 1

git fetch
git checkout "new brach"
git pull "new branch"
git merge "new branch"

This is worked for me

Answer 2

You are just fetching upstream/develop, while you want to fetch origin to have origin/mac8 available.

Answer 3

There is probably no corresponding branch in origin/xxx.