[Python] Poetry install on an existing project Error "does not contain any element"

I am using Poetry for the first time. I have a very simple project. Basically

a_project
|
|--test
| |---test_something.py
|
|-script_to_test.py


From a project I do poetry init and then poetry install

I get the following

poetry install
Updating dependencies
Resolving dependencies... (0.5s)

Writing lock file

Package operations: 7 installs, 0 updates, 0 removals

• Installing attrs (22.2.0)
• Installing exceptiongroup (1.1.0)
• Installing iniconfig (2.0.0)
• Installing packaging (23.0)
• Installing pluggy (1.0.0)
• Installing tomli (2.0.1)
• Installing pytest (7.2.1)

/home/me/MyStudy/2023/pyenv_practice/dos/a_project/a_project does not contain any element


after this I can run poetry run pytest without problem but what does that error message mean?

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