Çözüldü Koddaki hata nedir?

import numpy as np
import matplotlib.pyplot as plt
from tkinter import *
import tkinter as tk  # Tkinter modülünü içe aktar

class FunctionPlotter:
    def __init__(self, root):
        self.root = root
        self.root.title("Fonksiyon Grafiği Çizici")
        self.input_frame = Frame(self.root)
        self.input_frame.pack(side=LEFT)
        self.plot_frame = Frame(self.root)
        self.plot_frame.pack(side=RIGHT)
        self.functions = []
        self.create_input_widgets()
        self.create_plot_widgets()
    def create_input_widgets(self):
        self.function_entry = Entry(self.input_frame, width=20)
        self.function_entry.pack(pady=10)
        self.add_button = Button(self.input_frame, text="Fonksiyon Ekle", command=self.add_function)
        self.add_button.pack()
        self.finish_button = Button(self.input_frame, text="Bitti", command=self.plot_functions)
        self.finish_button.pack(pady=10)
    def add_function(self):
        function_entry = Entry(self.input_frame, width=20)
        function_entry.pack(pady=5)
        self.functions.append(function_entry)
    def plot_functions(self):
        x = np.linspace(-10, 10, 400)
        colors = ['r', 'g', 'b', 'c', 'm', 'y']  # Farklı renkler
        plt.figure()
        for i, function_entry in enumerate(self.functions):
            try:
                function_str = function_entry.get()
                y = eval(function_str)
                plt.plot(x, y, label='f(x) = ' + function_str, color=colors[i % len(colors)])
            except Exception as e:
                print("Hata: Geçersiz fonksiyon!")
        plt.axhline(0, color='black', linewidth=1)  # y=0 çizgisi
        plt.axvline(0, color='black', linewidth=1)  # x=0 çizgisi
        plt.title('Girilen Fonksiyonların Grafikleri')
        plt.xlabel('x')
        plt.ylabel('f(x)')
        plt.grid(True)
        plt.legend()
        plt.show()
    def create_plot_widgets(self):
        # Burada isteğinize göre plot_frame'e grafik oluşturulabilir.

root = Tk()      <----------- HATA BU SATIRDA
function_plotter = FunctionPlotter(root)
root.mainloop()