Heroku Asking for Repo on Force Push to Subtree Branch

The SHA values of my app became separated, so I needed to do a force push from the git repo into the subtree, but it keeps telling me:

You must provide

 <repository> <ref>

However, if I provide a repository, it tells me:

 'https://git.heroku.com/quoriron-client.git' does not exist; use 'git 
  subtree add'

How can I do a force push to Heroku if I'm not able to push to the app or repo name?