qt.qpa.plugin: Could not load the Qt platform plugin "windows" in "" even though it was found.

[sambaPython24]

Hello, despite having installed all requirements, I get the following error when running pyflow

qt.qpa.plugin: Could not load the Qt platform plugin "windows" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: direct2d, minimal, offscreen, windows.

What do I have to install?