# Plotly graph doesn't react on Heroku

**URL:** <https://community.plotly.com/t/plotly-graph-doesnt-react-on-heroku/6039>\
**Category:** Dash Python\
**Created:** [October 2, 2017, 9:22pm UTC](https://community.plotly.com/t/plotly-graph-doesnt-react-on-heroku/6039 "2017-10-02T21:22:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![nicolasescobar](https://avatars.discourse-cdn.com/v4/letter/n/ce73a5/32.png) [@nicolasescobar](https://community.plotly.com/u/nicolasescobar)\
**Post date:** [October 2, 2017, 9:22pm UTC](https://community.plotly.com/t/plotly-graph-doesnt-react-on-heroku/6039/1 "2017-10-02T21:22:58Z")

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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: [https://dash-bancas.herokuapp.com/](https://dash-bancas.herokuapp.com/)  
Python code: [https://github.com/nicolasescobar0325/dash-heroku/blob/master/app.py](https://github.com/nicolasescobar0325/dash-heroku/blob/master/app.py)

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**Author:** ![nicolasescobar](https://avatars.discourse-cdn.com/v4/letter/n/ce73a5/32.png) [@nicolasescobar](https://community.plotly.com/u/nicolasescobar)\
**Post date:** [October 2, 2017, 9:34pm UTC](https://community.plotly.com/t/plotly-graph-doesnt-react-on-heroku/6039/2 "2017-10-02T21:34:23Z")

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requirements.txt: [https://github.com/nicolasescobar0325/dash-heroku/blob/master/requirements.txt](https://github.com/nicolasescobar0325/dash-heroku/blob/master/requirements.txt)  
.gitignore: [https://github.com/nicolasescobar0325/dash-heroku/blob/master/.gitignore](https://github.com/nicolasescobar0325/dash-heroku/blob/master/.gitignore)  
Procfile: web: gunicorn app:server

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**Author:** ![chriddyp](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/chriddyp/32/16855_2.png) [@chriddyp](https://community.plotly.com/u/chriddyp)\
**Post date:** [October 2, 2017, 10:28pm UTC](https://community.plotly.com/t/plotly-graph-doesnt-react-on-heroku/6039/3 "2017-10-02T22:28:12Z")

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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.