Tips:'Application error'，when I visit the demo link.

[GordenMo]

tip detail:
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail

pic:

Demo link:
https://flight-price-prediction-api.herokuapp.com/

[iamaakashpal]

Heroku is not providing free dyno anymore. i. e. Heroku is not freely available.