pgbackup issue

terminal.txt

michael-fullers-macbook-pro-2:/ michaelfuller$ heroku pg:backups capture --app promoconnection
 !    `pg:backups` is not a heroku command.
 !    Perhaps you meant `pgbackups`.
 !    See `heroku help` for additional details.
michael-fullers-macbook-pro-2:/ michaelfuller$ heroku pgbackups capture --app promoconnection
 !    Please add the pgbackups addon first via:
 !    heroku addons:add pgbackups
michael-fullers-macbook-pro-2:/ michaelfuller$ heroku addons:add pgbackups
 !    No app specified.
 !    Run this command from an app folder or specify which app to use with --app <app name>
michael-fullers-macbook-pro-2:/ michaelfuller$ heroku addons:add pgbackups --app promoconnection
----> Adding pgbackups to promoconnection... failed
 !    Add-on plan not found.