Deployed a Flask App using Heroku but when i open that app it gives me error ""

So i deployed my flask app on heroku but when i clikc on run app on heroku , the app opens on another link and it gives an error "Application error 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"