Application Error while deploying in heroku, but in runs locally

When I try to deploy the app in heroku, I get Application Error, but I can run that app with heroku locally, but running heroku local command. What to do? Here is the url of the deployed app.

Thanks in advance.

Don't panic, start reading heroku logs if you did not start already, I am sure that, its gonna helpful.

1. $ heroku logs -n 1500
2. $ heroku logs -t
3. $ heroku run rails c'log/production.log', 'r').each_line { |line| puts line }