error: src refspec refs/heads/Khavushka does not match any error: failed to push some refs to 'https://github.com/Khavushka/Projekt-uge-12.git' code example

Example 1: rror: src refspec master does not match any. error: failed to push some refs to 'https://git.heroku.com/thawing-retreat-68019.git'

git push heroku HEAD:master

Example 2: error: src refspec main does not match any error: failed to push some refs to 'https://github.com/majeduli/paul-template.git'

error: src refspec master does not match any.  
error: failed to push some refs to 'ssh://xxxxx.com/project.git'

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C Example