ValueError: numpy.dtype size changed #2445
Description
How to reproduce the behaviour
Just run doccano webserver --port 8000 and visit localhost:8000.
Your Environment
- Operating System: CachyOS x86_64
- Python Version Used: Python 3.11.11
- When you install doccano: Aug 24, 2025
- How did you install doccano (Heroku button etc): using pipx.
It seems docanno uses pandas<2.0.0,>=1.4.2 but since those pandas do not restrict the numpy so it just uses the newest numpy, that doesn't compatible. The solution is to downgrade numpy. I recommended using numpy below 2.0.0 since this project must not use >2.0.0 version (the latest release is July 2023).
- using pip
pip install "pandas<2.0.0"- using pipx
pipx runpip doccano install "pandas<2.0.0"