Can you also update your two example files over there ? This will allow to more quickly set things up to test for the person taking the ticket on.

• Qt6Qml.dll
• Qt6Core.dll
• Qt6QuickShapesDesignHelpers.dll

But Qt6QuickShapesDesignHelpers.dll doesn't exist in the PySide6 package.
However it does exist in the C++ version which is why it was working in that case.

I reported the bug at https://qt-project.atlassian.net/browse/PYSIDE-3417
Thank you for your help.

It also fails on macOS because of a missing framework so I am thinking that this is a packaging issue.

You can also start you script using QT_DEBUG_PLUGINS=1 python main.py to have more information about what is happening.

The error states that the dll is missing, but you say it's there. Is it located where the message states it is missing ?

From my first message, the dll is located at:

C:\Users\favierl\Documents\temp_test_qtquick_shapes_design_helpers\.venv\Lib\site-packages\PySide6\qml\QtQuick\Shapes\DesignHelpers\qtquickshapesdesignhelpersplugin.dll

While the message states that it is missing at:

C:\Users\favierl\Documents\temp_test_qtquick_shapes_design_helpers\.venv\Lib\site-packages\PySide6\qml\QtQuick\Shapes\DesignHelpers\qtquickshapesdesignhelpersplugin.dll

So this is the same path.

Can you check whether all the dependencies of this dll are findable ?

I don't know how to do that. However I checked if I could use the QtQuick.Shapes.DesignHelpers via a C++ application, not PySide6, and i can!
Interestingly, replacing the DesignHelpers folder from the .venv with the one used when compiling C++ has no effect.

Does this module work on your machines with PySide6?
I even tried on a Linux computer and I still get the same error. I hope I'm doing something wrong.

Some maybe silly questions:

• The error states that the dll is missing, but you say it's there. Is it located where the message states it is missing ?
• Can you check whether all the dependencies of this dll are findable ?

PS C:\Users\favierl\Documents\temp_test_qtquick_shapes_design_helpers> uv tree
Resolved 5 packages in 2ms
temp-test-qtquick-shapes-design-helpers v0.1.0
└── pyside6 v6.11.1
    ├── pyside6-addons v6.11.1
    │   ├── pyside6-essentials v6.11.1
    │   │   └── shiboken6 v6.11.1
    │   └── shiboken6 v6.11.1
    ├── pyside6-essentials v6.11.1 (*)
    └── shiboken6 v6.11.1
(*) Package tree already displayed
PS C:\Users\favierl\Documents\temp_test_qtquick_shapes_design_helpers> uv run .\main.py
QQmlApplicationEngine failed to load component
file:///C:/Users/favierl/Documents/temp_test_qtquick_shapes_design_helpers/Main.qml:5:1: Impossible de charger la bibliothÞque C:\Users\favierl\Documents\temp_test_qtquick_shapes_design_helpers\.venv\Lib\site-packages\PySide6\qml\QtQuick\Shapes\DesignHelpers\qtquickshapesdesignhelpersplugin.dllá: Le module spÚcifiÚ est introuvable.

Other modules such as QtQuick, QtQuick.Layouts, QtQuick.Controls and even QtQuick.Shapes are imported without errors.

import os
from pathlib import Path
from PySide6.QtCore import QCoreApplication


app = QGuiApplication(sys.argv)
engine = QQmlApplicationEngine()

pyside_qml_path = Path(sys.site_packages) if 'site_packages' in globals() else Path(sys.executable).parent / "Lib" / "site-packages" / "PySide6" / "qml"

qml_import_path = Path(__file__).parent / ".venv" / "Lib" / "site-packages" / "PySide6" / "qml"
if qml_import_path.exists():
    engine.addImportPath(str(qml_import_path))

engine.load("Main.qml")
if not engine.rootObjects():
    sys.exit(-1)
sys.exit(app.exec())