[Python] Must construct a QApplication while it is already constructed?

Here is the code.

import sys

from PyQt6.QtWidgets import QApplication
from qpageview import View

app = QApplication(sys.argv)
view = View()
view.show()
sys.exit(app.exec())


When I run it from console, I get "QWidget: Must construct a QApplication before a QWidget" error. But if I change PyQt6 to PyQt5, it works and shows the widget (qpageview is also installed and works properly). Isn't a row with QApplication enough to construct QApplication in PyQt6?

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