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Check that the coverage module is installed on your system by running the command "pip install coverage".
Make sure that the coverage module is included in the requirements.txt file.
Review your tox.ini file to ensure it is properly configured to use the coverage module. You may need to update the configuration to include reference to the coverage module.
Try running tox in a virtual environment to see if the issue persists. If so, try running tox with different versions of Python to see if the issue is version-specific.
If none of the above steps resolve the issue, try reaching out to the community or support team for the project or package you are working on. They may have additional insights or solutions to the problem.