When trying the Heroku url:
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.
2016-06-30T09:50:50.412023+00:00 heroku[router]: at=error code=H10 desc=“App crashed” method=GET path="/" host=APPNAME.herokuapp.com request_id=5477cc40-eb39-4dd3-9a3a-14d1f3ad0022 fwd=“IP” dyno= connect= service= status=503 bytes=
Any ideers on what the problem is?