Error encountered when setting QT window transparent shaded border:

The widget used in the code implementation is embedded with a frame, and the white background and fillet style settings are set for the frame

Then directly call the setgraphicseffect method on the widget to add the shadow effect, and the above error occurs.

Solution:

Remove the shadow setting of the widget and directly set the shadow on the frame, UI -> frame-> Setgraphicseffect calls shadow.

After testing, the above error printing will not appear again.