Hi, to learn how to use QStackedWindow from PyQt6 I was watching at this video but following the tutorial and trying to run the code I get the error in the title, does anyone know why?

I want to clarify, the tutorial is for PyQt5 and I use PyQt6 but I made some modifications to the code to adjust it to PyQt6, unfortunately I had to do that because I did not find any tutorial to learn QtStackedWidget in PyQt6.