As the title suggest, I get this error when the Streamlit app calls a function which uses a library dependent on PyTorch. However, everything works smoothly locally, and I successfully installed all the dependency on he cloud through a conda environment .yml file, included Ninja (see the following pictures).
The repository I’m trying to deploy can be found here: https://github.com/voidpunk/Trial-AId
Just solved! LOL
SOLUTION:
I just added a packages.txt file with the following dependencies:
ninja-build
build-essential
Great that you found it! And thanks for posting the solution for others to see 
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