tkinter.TclError: can't invoke "canvas" command

[cybertooth]

I am getting this tcl error and unable to solve it. Here is the full exception. This happens when I exit the program

Error:
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\INDIAN\AppData\Local\Programs\Python\Python38\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)
  File "C:\Users\INDIAN\Desktop\python exercises\pygametooth\untiltledtry 15-2-23.py", line 65, in select_folder
    canvas.delete("all")
  File "C:\Users\INDIAN\AppData\Local\Programs\Python\Python38\lib\tkinter\__init__.py", line 2818, in delete
    self.tk.call((self._w, 'delete') + args)
_tkinter.TclError: invalid command name ".!canvas"
Traceback (most recent call last):
  File "C:\Users\INDIAN\Desktop\python exercises\pygametooth\untiltledtry 15-2-23.py", line 135, in <module>
    canvas = Canvas(root, width=800, height=500, bg="white")
  File "C:\Users\INDIAN\AppData\Local\Programs\Python\Python38\lib\tkinter\__init__.py", line 2683, in __init__
    Widget.__init__(self, master, 'canvas', cnf, kw)
  File "C:\Users\INDIAN\AppData\Local\Programs\Python\Python38\lib\tkinter\__init__.py", line 2567, in __init__
    self.tk.call(
_tkinter.TclError: can't invoke "canvas" command: application has been destroyed
>>> 

import tkinter as tk
from tkinter import Canvas, NW
from tkinter import filedialog
import os
import pygame
import cv2
import numpy as np
from PIL import Image, ImageTk


image_tk = None # Placeholder variable for PhotoImage

# Initialize Pygame
pygame.init()





def select_folder():
    # Open a file dialog to select the folder
    root.filename = filedialog.askdirectory()

    # Load the images from the selected folder
    images = []
    for f in os.listdir(root.filename):
        if f.endswith((".png", ".jpg", ".bmp", ".dcm")):
            image = cv2.imread(os.path.join(root.filename, f))
            if image is not None:
                images.append(image)

    # Set the initial image
    current_image = 0

    # Main loop
    running = True
    while running:
        # Handle events
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    current_image = (current_image - 1 + len(images)) % len(images)
                elif event.key == pygame.K_RIGHT:
                    current_image = (current_image + 1) % len(images)

        
        
        # Clear the canvas
        canvas.delete("all")

        # Get the dimensions of the current image
        height, width = images[current_image].shape[:2]
        # Set the rotation angle
        angle = 90

        # Calculate the center of the image
        center = (width // 2, height // 2)

        # Create the rotation matrix
        rotation_matrix = cv2.getRotationMatrix2D(center, angle, 1.0)
        # Calculate the new dimensions of the rotated image
        new_width, new_height = height, width

        # Rotate the image
        rotated = cv2.warpAffine(images[current_image], rotation_matrix, (new_width, new_height))

        # Convert the BGR image to RGB
        rgb_image = cv2.cvtColor(rotated, cv2.COLOR_BGR2RGB)

         

        # Convert the OpenCV image to a PIL ImageTk
        pil_image = Image.fromarray(np.rot90(rgb_image, 3))
##        pil_image = Image.fromarray(rgb_image)
        image_tk = ImageTk.PhotoImage(image=pil_image)

        # Display the image in the tkinter window
        canvas.create_image(0, 0, image=image_tk, anchor=NW)
        canvas.image = image_tk

        # Update the screen
        root.update()

def exit_program():
    root.destroy()

def on_key_press(event):
    if event.keysym == "Left":
        pygame.event.post(pygame.event.Event(pygame.KEYDOWN, {"key": pygame.K_LEFT}))
    elif event.keysym == "Right":
        pygame.event.post(pygame.event.Event(pygame.KEYDOWN, {"key": pygame.K_RIGHT}))

# Create the GUI
##root = tk.Tk()
root.title("Multi-angle Image Viewer")
root.geometry("800x600")

# Add a button to select the folder
button = tk.Button(root, text="Select Folder", command=select_folder)
button1 = tk.Button(root, text="Exit", command=exit_program)
button.pack()
button1.pack()

# Create the canvas to display the images
canvas = Canvas(root, width=800, height=500, bg="white")
canvas.pack()

# Bind the arrow keys to the canvas
canvas.bind("<Key>", on_key_press)
canvas.focus_set()

# Run the GUI


# Run the GUI
root.mainloop()

### Create the canvas to display the images
canvas = Canvas(root, width=800, height=500, bg="white")
canvas.pack()

# Run the GUI
root.mainloop()