[PyQt] Getting a couple errors when I try and start a QMainWindow from a QMainWindow

[dizou]

I am trying to create another QMainWindow when I click an action in my
QMainWindow. I get these errors when I click the action:

X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 3 (X_GetWindowAttributes)
  Resource id:  0x1800165
X Error: BadValue (integer parameter out of range for operation) 2
  Extension:    144 (Uknown extension)
  Minor opcode: 7 (Unknown request)
  Resource id:  0x1800165
X Error: BadValue (integer parameter out of range for operation) 2
  Extension:    144 (Uknown extension)
  Minor opcode: 7 (Unknown request)
  Resource id:  0x1800165

Here is my code:

class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.main = MainWidget()        
        self.setCentralWidget(self.main)
    def ViewNodeMovement3D(self):
        self.main.ViewNodeMovement3D()

class MainWidget(QWidget):
    def __init__(self):
        QWidget.__init__(self)
    def ViewNodeMovement3D(self):
        vtkWindow = DisplayView3D(self)
        vtkWindow.show()

class DisplayView3D(QMainWindow):
    def __init__(self, parent):
        QMainWindow.__init__(self, parent)

        self.vtkWidget = QVTKRenderWindowInteractor()
     
        self.ren = vtk.vtkRenderer()
        self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)
        
        self.setCentralWidget(self.vtkWidget)
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