How to fix pyqt error?

Question

PyQt

I get an error:

Must construct a QApplication before a QWidget
main.py:

import sys
from PySide6.QtWidgets import QApplication, QMainWindow
from windows.mainWindow import MainWindow



if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = MainWindow()
    window.show()

    
    sys.exit(app.exec())

MainWindow.py:

from PyQt5.QtWidgets import  QMainWindow

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setWindowTitle('MainWindow')

Answer 1

class MainWindow(QMainWindow):
    def __init__(self):
        super(QMainWindow, self).__init__()
        self.setWindowTitle('MainWindow')

Answer 2

Because in main.py you use PySide6, and in MainWindow.py PyQt5

Answer 3

You have in main.py import PySide6, in MainWindow.py import PyQt5. Either put on shorts, or take off the cross :)