git push --set-upstream origin master error: src refspec master does not match any code example

Example 1: error: src refspec master does not match any.

git config --global user.email "[email protected]"

git config --global user.name "Your Name"

Example 2: error: src refspec master does not match any.

git init
git add . //to add everything
git commit -m ''
git remote -v
git push heroku master