This string usually means that there is an obfuscated variable or corrupt bytecode cache for an automated Python build.
To be able to delete such cache, run find . -name '*.pyc' -delete or to delete them all, delete all the '__pycache__' folders. Then, in your virtual environment, type pip install --upgrade --force-reinstall, and you'll see that the syntax encoding is now UTF-8, and damaged package hashes are in your requirements.txt file.