I am leaving a solution for this error which keeps happening because of my impatience.

The error usually occurs when I input

$ git push origin master

This happens when push occurs without pull. Git prevents such operations which could overwrite the history. In my case, I will create a repo and often forget to clone or pull the branch before pushing the intialization.

So the solution is as following:

$ git init $ git add . $ commit -m <whatever the message you want> $ git remote add origin <URL> $ git push -u origin master

If the problem occured beacuase there was no branch (master in this case).

$ git checkout -b 'master' $ git push origin master

However, as I explained this can occured due to various situations. So if you understand the main cause you could fix it otherwise.