Deploying on heroku

[jennakwon06]

I am trying to deploy this application on heroku just to see how I can interact with app & event server & engine running all running servers but am getting this error (Planning on destroying the app afterwards)

config_file=./config/unicorn-production.rb would not be accessible in working_directory=/home/tapster/Demo-Tapster
I understand this may be because /home/tapster/Demo-Tapster doesn't exist for me, but how may I change the path so that the app can run on a server?

Thank you!