RuntimeError: super-class __init__() of type MainWindow was never called

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As I was coding the other day, I suddenly started getting this error: RuntimeError: super-class __init__() of type MainWindow was never called. I wasn't modifying anyhing in the near vicinity of the main window code, but even tracing back on my modifications I couldn't get the module to execute again. I isolated the startup code to the one below, but still get the error. For the life of me, I have no idea what it is. Help!!!

from PyQt6.QtWidgets import QApplication, QMainWindow

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("My PyQt6 Application")


if __name__ == "__main__":
    try:
        app = QApplication([])
        mainApplication = MainWindow()
        app.exec()  # Start the event loop

    except Exception as e:
        print(f"An exception occurred: {e}")