at=error code=H10 desc="App crashed" method=GET path="/" dyno= connect= service= status=503 bytes [on hold]

Thanks for helping! I have been working right with my app in ruby on rails hosted on heroku. Recently i made the last deploy and then in heroku i have this error:

2015-06-23T14:41:26.023607+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=lapapaya.org request_id=6d86d516-71cc-4892-a668-4df4a0326e30 fwd="186.27.168.226" dyno= connect= service= status=503 bytes=

I can't understand what is the origin of the error. It seems it have relation with dyno, but don't understand. Any of you have something similar?