GitHub - How to resolve this issue of preventing push to origin?

When I try to push my application to 'GitHub' using 'Git', I get the
following:

    $ git push origin master
    Enter passphrase for key '/c/Users/Medicine - SWEng/.ssh/id_rsa':
    ERROR: Repository not found.
    fatal: The remote end hung up unexpectedly

**EDIT:**

Output of running `git remote -v`:

    $ git remote -v
    heroku git@heroku.com:young-rain-273.git (fetch)
    heroku git@heroku.com:young-rain-273.git (push)
    origin git@github.com:SWEngineer7sample_app.git (fetch)
    origin git@github.com:SWEngineer7sample_app.git (push)
    sample git@github.com:SWEngineer/sample_app.git (fetch)
    sample git@github.com:SWEngineer/sample_app.git (push)

How can I solve this issue?

Thanks.

This is a mailing list about Rails; questions that are just about
GitHub and/or Git ought to be posted to a GitHub or Git mailing list,
please.

That said, it looks like there is a typo in your 'origin' remote URL:
'7' should be '/'.

Chris