ModuleNotFoundError: No module named
Problem
You receive the error ModuleNotFoundError: No module named when you deploy an app on Streamlit Cloud.
Solution
This error occurs when you import a module on Streamlit Cloud that isn’t included in your requirements file. Any external Python dependencies that are not distributed with a standard Python installation should be included in your requirements file.
E.g. You will see ModuleNotFoundError: No module named 'sklearn' if you don’t include scikit-learn in your requirements file and import sklearn in your app.
Related forum posts:
https://discuss.streamlit.io/t/getting-error-modulenotfounderror-no-module-named-beautifulsoup/9126
https://discuss.streamlit.io/t/modulenotfounderror-no-module-named-vega-datasets/16354
