[Python] EXE created with Pyinstaller fails to import qtmodern as specified in hook

I’m trying to create an EXE based on a Python project. I am using the following command from within a Poetry virtual environment in Powershell on Windows 11: pyinstaller --onefile --additional-hooks-dir=hooks main.py. The generated EXE fails with the following message:

Traceback (most recent call last):
File "main.py", line 4, in <module>
ModuleNotFoundError: No module named 'qtmodern'
[PYI-11344:ERROR] Failed to execute script 'main' due to unhandled exception!


main.py, line 4: import qtmodern.styles

The hooks folder is located within the folder that contains main.py. It contains a single file, hook-qtmodern.py, with the following contents:

from PyInstaller.utils.hooks import collect_data_files

datas = collect_data_files("qtmodern", includes=["**/*.qss"])

from PyInstaller.utils.hooks import collect_data_files

datas = collect_data_files("qtmodern", includes=["**/*.qss"])

hiddenimports = [
"qtmodern.styles",
"qtmodern.windows",
]


Does anyone know what I am missing or have advice about how to tackle this issue?

Edit: I noticed there is a Qt folder within the project with a bunch of files that appear to work in pairs: a _ui.py and a matching .ui.

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