Почему метод display_message не работает?

Question

Сообщение об ошибке:

File "C:\Users\think\PycharmProjects\network_monitor\Untar_DDC.py", line 16, in untar_file
    notice.display_message("11untar_file : " + untar_filename + untar_location)
  File "C:\Users\think\PycharmProjects\network_monitor\monitor.py", line 469, in display_message
    self.dis_message.setText(message)
AttributeError: 'Ui_MainWindow' object has no attribute 'dis_message'

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# Untar_DDC.py

import os
import sys
import tarfile
from monitor import Ui_MainWindow

class Untar_DDC:

    def untar_file(self, untar_filename, untar_location):
        notice = Ui_MainWindow()
        notice.display_message("11untar_file : " + untar_filename + untar_location)

-

# monitor.py

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):

    def setupUi(self, MainWindow):

        MainWindow.setObjectName("MainWindow")
        self.dis_message = QtWidgets.QTextBrowser(self.splitter)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.dis_message.sizePolicy().hasHeightForWidth())
        self.dis_message.setSizePolicy(sizePolicy)
        self.dis_message.setObjectName("dis_message")

    def display_message(self,message):

        self.dis_message.setText(message)