[Error Handling]: ImportError while importing test module (Error-Handling Messaging & Exercises)

Good day. I first offer the obligatory "I'm not GitHub-savvy" apology. I did look for an answer as prescribed here, following steps in subheading Opening an Issue. But I have not seen anything. I've seen some fixes on Stack Overflow. But they make no sense to me. Please don't crush me if I'm doing this wrong.

I'm working on a new linux install. On my previous installation, I ran pytest successfully many times (28 to be precise). With this new installation, I've run it once successfully on exercise Twelve Days of Christmas. It's giving me this error now:

$ /home/dan/.local/bin/pytest meetup_test.py 
============================= test session starts ==============================
platform linux -- Python 3.8.5, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: /home/dan/exercism/python/meetup
collected 0 items / 1 error                                                    

==================================== ERRORS ====================================
_______________________ ERROR collecting meetup_test.py ________________________
ImportError while importing test module '/home/dan/exercism/python/meetup/meetup_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib/python3.8/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
meetup_test.py:4: in <module>
    from meetup import meetup, MeetupDayException
E   ImportError: cannot import name 'MeetupDayException' from 'meetup' (/home/dan/exercism/python/meetup/meetup.py)
=========================== short test summary info ============================
ERROR meetup_test.py
!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
=============================== 1 error in 0.09s ===============================
$

I tried removing the meetup directory and re-downloading from the CLI. I get this error no matter what the contents of meetup.py are. So, I'm guessing that I have some issue either with they way pytest is configured or with my meetup_pytest file.

Any assistance greatly appreciated.

Thank you so much.
Dan.