I'm trying to create a simple yes/no dialog box

[RedSkeleton007]

For some reason, despite defining all of the buttons, labels, and packing them, my window comes up blank when I run the program:

#!/usr/bin/python
#BackdoorLogin_DialogBox.py

import tkinter as tk#for python 2, it's import Tkinter as tk
from tkinter import ttk
import sys

myFont = ("Verdana", 10)

class MyWindows(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        container = tk.Frame(self)

        container.pack(side="top", fill="both", expand=True)

        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}#assign self.frames to an empty dictionary

        frame = myWindow(container, self)

        self.frames[myWindow] = frame

        frame.grid(row=0, column=0, sticky="nsew")#nsew = north south east west

        self.show_frame(myWindow)

    def show_frame(self, cont):
        frame = self.frames[cont]#cont means container, NOT controller.
        frame.tkraise()

def functionTest():
    print("Function invoked successfully.")

def popupmsg():
    popup = tk.Tk()

    def activateBackdoor():
        #code to invoke BackdoorLogin.py goes here.
        popup.destroy()
        #myWindow.destroy()

    popup.wm_title("Program activated.")
    label = ttk.Label(popup, text="You have been hacked!")
    label.pack(side="top", fill="x", pady=10)
    button1 = ttk.Button(popup, text="Ok", command=activateBackdoor)
    button1.pack()
    popup.mainloop()

def myWindow():
    myWindow = tk.Tk()

    myWindow.wm_title(self, "Program from unknown source.")
    label1 = ttk.Label(self, text="Program from an unknown source.", font=myFont)
    label1.pack(pady=10,padx=10)
    label2 = ttk.Label(self, text="Do you want to allow this program to access your computer?", font=myFont)
    label2.pack(pady=10,padx=10)

    button1 = ttk.Button(self, text="yes", command=popupmsg)
            
    button2 = ttk.Button(self, text="no", command=myWindow.destroy)
    button1.pack()
    button2.pack()
    myWindow.mainloop()

            

def main():
    myWindow()

main()

firstWindow = MyWindows()
firstWindow.mainloop()

With these errors:

Error:
=== RESTART: I:\Python\Python36-32\SamsPrograms\BackdoorLogin_DialogBox.py ===
Traceback (most recent call last):
  File "I:\Python\Python36-32\SamsPrograms\BackdoorLogin_DialogBox.py", line 74, in <module>
    main()
  File "I:\Python\Python36-32\SamsPrograms\BackdoorLogin_DialogBox.py", line 72, in main
    myWindow()
  File "I:\Python\Python36-32\SamsPrograms\BackdoorLogin_DialogBox.py", line 56, in myWindow
    myWindow.wm_title(self, "Program from unknown source.")
NameError: name 'self' is not defined
>>>

I'm exhausted. Why is this so difficult? What I want to do is so simple:

1. A yes or no dialog box comes up.

2. if the user clicks yes, the intitial dialog box disappears, and a message box pops up saying, "You have been hacked!" and then disappears when the user clicks the Ok button and ends the program.

3. if the user clicks no, the initial dialog box disappears and ends the program.

THAT'S IT! That's ALL I'VE WANTED to accomplish for the last 6+ hours!!!