Plotly graph doesn't react on Heroku

Hey there!

I’m trying to deploy my dash python app wich consists in a dropdown and a plotly graph that reacts when you change the value of the dropdown. Locally it works perfectly but when I deploy it at Heroku the graph shows empty and when I change the dropdown option the tab displays the following message: ‘updating…’ but nothing really happens. The active dropdown is the bottom one…

Appreciate any help on the matter.

Heroku link:
Python code:

Procfile: web: gunicorn app:server

I recommend looking at the heroku logs with $ heroku logs -t. From examining the network tab of chrome’s developer tools, it looks like there is a 500 error, which usually means an uncaught exception in your application code.

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