Видео с ютуба Qwidget: Must Construct A Qapplication Before A Qwidget

C++ :

C++ : "Must construct a QApplication before a QWidget"
C++ : Must construct a QApplication before a QWidget & Invalid parameter passed to C runtime functio

C++ : Must construct a QApplication before a QWidget & Invalid parameter passed to C runtime functio
How to Fix the QWidget: Must Construct a QApplication Before a QWidget Error in Qt

How to Fix the QWidget: Must Construct a QApplication Before a QWidget Error in Qt
Creating a NamedTuple or dataclass with Default PyQt5 QWidget

Creating a NamedTuple or dataclass with Default PyQt5 QWidget