# Error loading dash dependencies

**URL:** <https://community.plotly.com/t/error-loading-dash-dependencies/26640>\
**Category:** Dash Python\
**Created:** [July 31, 2019, 2:55pm UTC](https://community.plotly.com/t/error-loading-dash-dependencies/26640 "2019-07-31T14:55:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tkoukpar](https://avatars.discourse-cdn.com/v4/letter/t/a8b319/32.png) [@tkoukpar](https://community.plotly.com/u/tkoukpar)\
**Post date:** [July 31, 2019, 2:55pm UTC](https://community.plotly.com/t/error-loading-dash-dependencies/26640/1 "2019-07-31T14:55:05Z")

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Does anyone know why this problem would still persist?

My callback structure is as such:

Callback1  
–\> Output to hidden div --\> Output to dropdown  
–\> Output to change tab

Callback 2  
–\> Output to hidden div --\> Output to dropdown

This way I don’t have to output anything to ‘change tab’ when I use callback 2  
But apparently dash doesn’t like this I’m not sure why