В чем дело. Python GUI tkinter

from random import choice
from sys import exit as close
from time import strftime
import tkinter
from tkinter.filedialog import askopenfilename
 
def start():
    #root.withdraw()
    root.update()
    with open(askopenfilename(),'r') as file:
        #root.destroy() ###
        countries = dict([value.split(',') for value in file.read().replace(';',',').split()])
        del countries["Страна]
        return countries, list(countries.keys())
 
 
class Game():
    def __init__(self, values):
        self.n_countries, self.n_list = values
        self.country, self.question, self.res = ("","","") #
 
    def protocol(self, value):
        with open("protokoll.txt","a") as protocol:
            protocol.write(strftime("Дата: %d.%m.%Y  Время: %H:%M:%S\n\n") + "Вопрос: {}\n\nОтветt: {}\n\n\n".format(self.question, value)) ###
 
    def form_question(self):
        self.country = choice(self.n_list)
        self.question = "Столица " + self.country
        return self.question
 
    def check_answer(self, answer):
        answer = answer.capitalize()
        if answer == "Close":
            close()
        self.protocol(answer) ###
        if answer == self.n_countries[self.country]:
            self.res = "Правильно!"
            self.n_list.remove(self.country)
        else:
            self.res = "Неправильно!"
 
 
class Window(tkinter.Frame):
    def __init__(self, master = None):
        super().__init__(master)
        self.pack()
        self.create_widgets()
    def create_widgets(self):
        self.question = tkinter.Label(self)
        self.question["text"] = game.form_question()
        self.question.pack(side = "top", ipadx = 5, ipady = 10)
 
        self.inputEntry = tkinter.Entry(self)
        self.inputEntry.pack(ipadx = 50, ipady = 5)
 
        self.input = tkinter.StringVar()
        self.inputEntry["textvariable"] = self.input
 
        self.result = tkinter.Label(self)
        self.result["text"] = game.res
        self.result.pack(after = self.inputEntry, ipadx = 5, ipady = 10)
 
        self.ok = tkinter.Button(self)
        self.ok["text"] = "Ок"
        self.ok["command"] = game.check_answer(self.input.get())
        self.ok.pack(side = "right", ipady = 5, expand = True, fill = "both")
 
        self.close = tkinter.Button(self)
        self.close["text"] =  "Выйти"
        self.close["command"] = self.quit ###
        self.close.pack(side = "left", ipady = 5, expand = True, fill = "both")
 
root = tkinter.Tk()
root.title("Игра")
game = Game(start())
window = Window(root)
window.mainloop()