Pyside2 application failed to start

Pyside2 application failed to start

I just tried to test the newly released version of pyside2 (5.11) on Windows 10, 64bit version. But the "Hello World" example does not work. I am using Python 3.6 with PyCharm.The interpreter I use is from Anaconda. So I pip installed the pyside2 version and also tried to install via "conda install ..." the older version of pyside2. Both installations worked, but I get the same error message for both libraries.

The error message is pooping up in a separate secreen saying:" This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: minimal, offscreen, windows."

So I definetly can see the plugin files in the correct folder. I tried reinstalling. Deleted everything and tried other IDEs. But nothing solved the problem.

Any help appreciated.

1 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:

set QT_DEBUG_PLUGINS=1

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 couple of tickets related to a similar issue (not sure it is the same problem):

As a workaround, I have added the right path directly into the code (using QCoreApplication.addLibraryPath), it works in my case:

QCoreApplication.addLibraryPath

import sys, os from PySide2 import QtCore, QtGui, QtWidgets def main(): QtCore.QCoreApplication.addLibraryPath(os.path.join(os.path.dirname(QtCore.__file__), "plugins")) app = QtWidgets.QApplication() main_win = QtWidgets.QMainWindow() main_win.show() sys.exit(app.exec_())

A similar solution is described here: How to get path of a python module ( not sys.executable )

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