Application error

[DevinCLane]

Hi @khanhtranngoccva, meeting you from 100devs. I was looking into this but it throws this 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](https://devcenter.heroku.com/articles/logging#view-logs). You can do this from the Heroku CLI with the command heroku logs --tail

Cheers!