Heroku showing this message on the page:
"internal server error"
This error is showing in console:
GET https://frozen-gorge-82417.herokuapp.com/auth/github/callback?error=redirect_uri_mismatch&error_description=The+redirect_uri+MUST+match+the+registered+callback+URL+for+this+application.&error_uri=https%3A%2F%2Fdeveloper.github.com%2Fv3%2Foauth%2F%23redirect-uri-mismatch 500 (Internal Server Error)
Check the logs of your Heroku application to see more details. You can stream the log using the Heroku CLI after logging in:
heroku logs -t
Alternatively, you can view the logs on the app dashboard.