git push -u origin main error: src refspec main does not match any error: failed to push some refs to 'https://github.com/mhmomen/Versity-Project-2021.git' code example

Example: 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'