error: src refspec master does not match any herokku create code example

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

# You are trying to add an empty repository, add something first, like a readme
touch README.md
git add README.md
git commit -m "Initial commit"
git push --set-upstream origin master

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

git add .
git commit -m "Initial commit"
git push heroku HEAD:master