No backend match. Environment variables missing for: aws.js, mega.js

[enlighter]

After I deploy the current master at Heroku free Dyno, App page shows this:
Application Error An error occurred in the application and your page could not be served. Please try again in a few moments. If you are the application owner, check your logs for details.

And this is the output of heroku logs:
2016-05-05T01:18:00.616224+00:00 heroku[api]: Release v2 created by [email protected] 2016-05-05T01:18:00.616224+00:00 heroku[api]: Enable Logplex by [email protected] 2016-05-05T01:19:24.496990+00:00 heroku[api]: Deploy 35c516f by [email protected] 2016-05-05T01:19:24.496990+00:00 heroku[api]: Release v3 created by [email protected] 2016-05-05T01:19:24.496245+00:00 heroku[api]: Scale to web=1 by [email protected] 2016-05-05T01:19:24.962341+00:00 heroku[slug-compiler]: Slug compilation started 2016-05-05T01:19:24.962346+00:00 heroku[slug-compiler]: Slug compilation finished 2016-05-05T01:19:26.916202+00:00 heroku[web.1]: Starting process with commandnode server.js 2016-05-05T01:19:30.554267+00:00 app[web.1]: No backend match. Environment variables missing for: aws.js, mega.js 2016-05-05T01:19:31.638131+00:00 heroku[web.1]: State changed from starting to crashed 2016-05-05T01:19:31.639385+00:00 heroku[web.1]: State changed from crashed to starting 2016-05-05T01:19:31.630398+00:00 heroku[web.1]: Process exited with status 1 2016-05-05T01:19:33.047734+00:00 heroku[web.1]: Starting process with commandnode server.js2016-05-05T01:19:35.259335+00:00 app[web.1]: No backend match. Environment variables missing for: aws.js, mega.js 2016-05-05T01:19:35.968360+00:00 heroku[web.1]: Process exited with status 1 2016-05-05T01:19:35.948261+00:00 heroku[web.1]: State changed from starting to crashed 2016-05-05T01:20:02.174098+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=powerful-woodland-25592.herokuapp.com request_id=d74de48d-8a97-4fc1-b056-c3f806ed09f3 fwd="203.110.242.20" dyno= connect= service= status=503 bytes= 2016-05-05T01:20:03.829016+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=powerful-woodland-25592.herokuapp.com request_id=1a1d3e25-3b7e-45ff-aed5-58a050ebaa06 fwd="203.110.242.20" dyno= connect= service= status=503 bytes= 2016-05-05T01:20:04.873119+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=powerful-woodland-25592.herokuapp.com request_id=2c04d26b-95c0-43fa-9f3f-61fe97f0f478 fwd="203.110.242.20" dyno= connect= service= status=503 bytes=
How to solve this?

[enlighter]

Focused:
2016-05-05T01:19:33.047734+00:00 heroku[web.1]: Starting process with commandnode server.js2016-05-05T01:19:35.259335+00:00 app[web.1]: No backend match. Environment variables missing for: aws.js, mega.js 2016-05-05T01:19:35.968360+00:00 heroku[web.1]: Process exited with status 1 2016-05-05T01:19:35.948261+00:00 heroku[web.1]: State changed from starting to crashed

[electron0zero]

you have to set env variables for AWS or Mega while deploying, after deployment if you want to change those go to app>>settings>>revel config vars >> add mega credentials or AWS credentials.
it is all already mentioned in readme