[Tutor] underlying C/C++ object has been deleted

[Lawrence Shafer]

I am trying to convert a program with hand coded QT over to using UI 
files from QT Designer. I am getting the error below and do not 
understand what's going on. I have a feeling I need to add self. to 
something in here, but I'm not sure what. Is this enough code for you to 
see whats going on?? If not I can upload the project somewhere.  Thanks, 
Lawrence

The error,

Traceback (most recent call last):
  File "atf.py", line 113, in on_actionOpen_triggered
    self.open()
  File "atf.py", line 56, in open
    if self.isUntitled and self.textBrowser.document().isEmpty() and not 
self.isWindowModified():
RuntimeError: underlying C/C++ object has been deleted


Here is the first part of the code.

#!/usr/bin/env python
# iaC.py - A Qt4 Calculator example

import sys
from math import pi
from PyQt4 import QtCore, QtGui
from iac_ui import Ui_mainWindow
from filterEdit2_ui import Ui_filterEdit


class iaC(QtGui.QMainWindow):
    sequenceNumber = 1
    windowList = []

    @QtCore.pyqtSignature("")
    def __init__(self, fileName=None, parent=None):
        QtGui.QMainWindow.__init__(self, parent)

        self.init()
        if fileName:
            self.loadFile(fileName)
        else:
            self.setCurrentFile(QtCore.QString())

        self.ui = Ui_mainWindow()
        self.ui.setupUi(self)

# ================Set up delete, up, and down buttons on the main 
form==================
        if self.ui.listWidget.count() < 1:
            self.ui.deleteButton.setEnabled(False)
        else:
            self.ui.deleteButton.setEnabled(True)

        if self.ui.listWidget.count() < 2:
            self.ui.upButton.setEnabled(False)
            self.ui.downButton.setEnabled(False)
        else:
            self.ui.downButton.setEnabled(True)
            self.ui.upButton.setEnabled(True)

# ================Save settings on 
close?=======================================
    def closeEvent(self, event):
        if self.maybeSave():
            self.writeSettings()
            event.accept()
        else:
            event.ignore()

# ===============Open File=================================================
    @QtCore.pyqtSignature("")
    def open(self):
        fileName = QtGui.QFileDialog.getOpenFileName(self)
        print "Loading fileName", fileName
        if not fileName.isEmpty():

            if self.isUntitled and self.textBrowser.document().isEmpty() 
and not self.isWindowModified():
                self.loadFile(fileName)
            else:
                other = MainWindow(fileName)
                if other.isUntitled:
                    del other
                    return
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