InvalidRequirements error

[mosesmbadi]

I have installed flower as recommended inside my virtual environment
pip install flower
next tried to run it with celery like so
celery -A service_portal_api.celery_app flower
But it keeps throwing this error

  File "/home/mbadi/chemlabs/service-portal/venv/lib/python3.11/site-packages/pkg_resources/_vendor/packaging/requirements.py", line 37, in __init__
    raise InvalidRequirement(str(e)) from e
pkg_resources.extern.packaging.requirements.InvalidRequirement: Expected matching RIGHT_PARENTHESIS for LEFT_PARENTHESIS, after version specifier
    pytz (>dev)
         ~^

not sure if this is a bug or my environment issue