If you have deployed it to Heroku, you can check it directly at [heroku-id].herokuapp.com
If it's your first time, I recommend you to follow the getting started guide.
https://devcenter.heroku.com/articles/getting-started-with-rails4
The application log can be checked with the heroku logs command in the console, and there are many other monitoring tools.
There are a lot of good tips on Heroku Korea's Facebook group these days, so it's okay to take a look.
https://www.facebook.com/groups/1520058578303383/
heroku open
is a command to open the heroku page in your browser, so an error occurs in cloud 9.
The console you uploaded as an attached image is spinning in the cloud, so I can't launch the browser.
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