Error5 reports
Fix ModuleNotFoundError
in Poetry
✅ Solution
ModuleNotFoundError in Poetry projects usually means the Python interpreter can't find a package, often because the virtual environment isn't activated or Poetry hasn't correctly installed dependencies there. Ensure the Poetry virtual environment is activated (using `poetry shell` or `poetry run ...`) and that all project dependencies are installed by running `poetry install`. If problems persist, double-check your package names in `pyproject.toml` and ensure they match the import names used in your code.
Related Issues
Real GitHub issues where developers encountered this error:
poetry with in-project=true does not find installed packages when import name is different to package nameJul 9, 2025
I installed v2 poetry to a different folder and now the old install doesn't workMay 5, 2025
Poetry giving errorMay 2, 2025
poetry breaks itself in cmd. Also doesn't work in pycharm.Feb 19, 2025
Virtualenv doesn't have dependenciesJan 14, 2025
Timeline
First reported:Jan 14, 2025
Last reported:Jul 9, 2025