Проблема в коде в Python

 import tkinter as tk 
from tkinter import filedialog 
 
def add_document(): 
    # Function to add document logic here 
    pass 
 
def open_document(): 
    # Function to open document logic here 
    pass 
 
def delete_document(): 
    # Function to delete document logic here 
    pass 
 
root = tk.Tk() 
root.title("Электронный архив документов") 
 
# Frame for buttons 
button_frame = tk.Frame(root) 
button_frame.pack(side=tk.TOP, anchor="w", padx=10, pady=5) 
 
add_button = tk.Button(button_frame, text="Добавить документ", command=add_document) 
add_button.pack(side=tk.LEFT, padx=5) 
 
open_button = tk.Button(button_frame, text="Открыть документ", command=open_document) 
open_button.pack(side=tk.LEFT, padx=5) 
 
delete_button = tk.Button(button_frame, text="Удалить документ", command=delete_document) 
delete_button.pack(side=tk.LEFT, padx=5) 
 
back_button = tk.Button(button_frame, text="Назад", command=root.quit) 
back_button.pack(side=tk.LEFT, padx=5) 
 
# Search bar 
search_label = tk.Label(root, text="Поиск:") 
search_label.pack(anchor="w", padx=10, pady=5) 
 
search_entry = tk.Entry(root) 
search_entry.pack(fill=tk.X, padx=10, pady=5) 
 
# Listbox for documents 
document_listbox = tk.Listbox(root) 
document_listbox.pack(fill=tk.BOTH, expand=True, padx=10, pady=5) 
 
# Example documents 
documents = [ 
    "7 КОНФИГУРИРОВАНИЕ ПРОГРАММНЫХ И АППАРАТНЫХ СРЕДСТ.docx", 
    "Лист XLS.xlsx", 
    "видео 2022.pptx", 
    "Вата Акт проверки камер видеонаблюдения.docx", 
    "видео.pptx" 
] 
 
for doc in documents: 
    document_listbox.insert(tk.END, doc) 
 
root.mainloop()