PySide2 application failed to start

Question

I just tried to test the newly released version of PySide2 (5.11) on Windows 10, 64 bit version. But the \"Hello World\" example does not work. I am using Python 3.6 with Py

Answer 1

If you run the app after having set QT_DEBUG_PLUGINS=1, you should get more info on what is the issue. In my case, I was getting:

QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/xxxxx/AppData/Local/py3/platforms" ... qt.qpa.plugin: Could not find the Qt platform plugin "windows" in ""

Such a folder does not exist on my machine.

There are a few tickets somehow related to a similar issue (not sure it is the same problem):

• https://bugreports.qt.io/browse/PYSIDE-559
• https://github.com/pyside/pyside2-setup/issues/57
• https://github.com/conda-forge/matplotlib-feedstock/issues/2
• https://github.com/conda-forge/qt-feedstock/issues/71

My current working solution is to remove PyQt, qt and sip anaconda packages, then to manually delete a relic qt.conf in the root folder of the environment. After that, the official PyPi PySide2 wheel works fine.