Fixing Github Error: failed to push some refs to '[url...]'

When starting out in software development, it is a rite of passage to have some familiarity with Git and Github. This means that you may run into some stumbling blocks on your way to mastering the powerful tool. One of these stumbling blocks could be this error code;

 error: src refspec does not match any
 error: failed to push some refs to 'https://github.com/githubusername/repo-name.git'

This error code is often generated when you attempt to push a file from your local repository environment into the remote repository on Github.
It typically indicates that there is a mismatch between the local and remote repositories. This could happen for two reasons;

when you try to make a pull request and someone else has made changes to the remote repository since your last pull or
when you cloned a repository and then try to push a forked version of the repository back to Github in a different remote repository.

Surmounting the Problem

To address the cause of the first problem, the local Github repository should be synchronized with the remote repository. This is known as rebasing.

git pull --rebase origin <branchname>

Rebasing aligns any sequence of commits history to a single base commit for easy integration. Afterward, the commits can then be pushed to Github.

git push -u origin <branchname>

To address the second problem, which arises from a mismatch between the address of the remote repository and the address of the new repository to which the Github fork is being pushed. The solution is to set the URL of the new repository:

git remote set-url origin 'new-github-repo-link'

This command will be executed, but the system won't provide any feedback indication to the terminal. To verify that the remote repo was added to your configuration, use the command:

git remote –v

Final Words
I hope this has been helpful on your coding journey.
In conclusion, every bug has a solution. If per adventure the issue persists or your error code in the terminal is unique, it's always beneficial to explore all available learning resources such as Google, Stack Overflow, AI chatbots and YouTube.