PyQt6: DLL load failed while importing QtGui: The specified procedure could not be found.

[xiaoxstz]

PyQt6: DLL load failed while importing QtGui: The specified procedure could not be found.

[tab-cmd]

We encountered this issue in our GitHub actions build on Windows 10 in the last week or so. This happens using both Python 3.8.10 and 3.9.13. It seems to be caused by a mismatch between PyQt6 and PyQt6-Qt6 that installs when just using pip install PyQt6==6.6.0.

See: https://github.com/CAMBI-tech/BciPy/actions/runs/7092847344/job/19305011604#step:7:1591

We were able to resolve the issue by forcing the installs in the requirements.txt file:

PyQt6==6.6.0
PyQt6-Qt6==6.6.0

I have not tried other PyQt6 or Windows versions. Here's information on the Windows build system used in GitHub actions: https://github.com/actions/runner-images/releases/tag/win22%2F20231126.1

[hrvojej]

But when you do that pip installer reports:

`ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.

pyqt6-plugins 6.4.2.2.3 requires pyqt6==6.4.2, but you have pyqt6 6.6.0 which is incompatible.
pyqt6-plugins 6.4.2.2.3 requires pyqt6-qt6==6.4.3, but you have pyqt6-qt6 6.6.0 which is incompatible.
pyqt6-tools 6.4.2.3.3 requires pyqt6==6.4.2, but you have pyqt6 6.6.0 which is incompatible.`

Python 3.11.8
Windows 11