The add_variable function passes local tests but returns errors in the Web App and Notebooks

[PavelMakarchuk]

The following collab notebook demonstrates the issue:
Notebook

We currently use the add_variable function in two places:
In the winship.py file and the Colorado family affordability credit both currently return Errors in the notebook above and run and endless loop in the app. Colorado & Winship

[masterismail]

How can I effectively test changes made to policyengine-us locally on the web app?

[MaxGhenis]

You'd have to host the api locally. @nikhilwoodruff do you have instructions on this?