I’m having an issue trying to use the destroy() method in python.
I have created a class and was trying to make a window that would bring me to different frames, and destroy the ones I was on before.

from tkinter import *
import sys, os                       
class Interface:
    def startGame(self):
        frame.destroy()

        frame2 = Frame(window,background = "black")
        frame2.place(x=100,y=220)

        entry = Entry(frame2, bg="black",fg = "white",font=("Comic Sans", 30,"underline"))
        entry.pack()
        
        login = Button(frame2,text="Login")
        login.pack()

        cancel = Button(frame2,text="Cancel",command = window.mainloop)
        cancel.pack()
        
    def loadGame():
        pass

    def firstWindow(self):
        frame = Frame(window)
        picture = PhotoImage(file="dinossaur.png")

        label = Label(frame,
                      text="Final Project: Ultimate",
                      font=("Comic Sans", 40, "italic"),
                      fg="gray",
                      background = "maroon",
                      #relief = RAISED, bd = 10, padx = 9, pady = 9
                      image=picture,
                      compound = "bottom")
        frame.pack()
            
        start = Button(frame, text="Start Game", command =self.startGame)
        load = Button(frame,text="Load Game", command = self.loadGame)
        exitB = Button(frame,text="Exit",command = window.destroy)

        label.pack()
        start.place(x=220,y=240)
        load.place(x=220,y=270)
        exitB.place(x=220,y=300)

    # to change icon on top left!
    ##icon = image(file="logo.png")
    ##window.iconphoto(True, icon)


window = Tk()
window.geometry("640x480")
window.title("Final Project: Ultimate")
window.config(background="maroon")

game = Interface()
game.firstWindow()

window.mainloop()

But whenever I run it, I find a couple of issues:
the image is not showing, and startGame() gives me the following error:

Exception in Tkinter callback
Traceback (most recent call last):
File “C:UsersbetoiAppDataLocalProgramsPythonPython312Libtkinter_init_.py”, line 1962, in call
return self.func(*args)
^^^^^^^^^^^^^^^^
File “C:/Users/betoi/OneDrive/Área de Trabalho/finalProject/interface.py”, line 5, in startGame
frame.destroy()
^^^^^
NameError: name ‘frame’ is not defined. Did you mean: ‘Frame’?