Как исправить ошибку в моей программе?

from tkinter import*
import requests
from bs4 import BeautifulSoup
from datetime import datetime

window = Tk()
window.geometry("400x350+300+300")
window.title("Курс валют")

url = " http://www.cbr.ru/scripts/XML_daily.asp ?"

today = datetime.today ()
today = today.strftime("%d/%m/%Y")

payload = {"date_req" : today}

responce = requests.get(url, params = payload)

xml = BeautifulSoup(responce.content, 'html.parser')

def getCourse(id):
return xml.find('valute', {'id': id}).value.text

img_logo = PhotoImage(file='logo.png')
logo = Label(window, image=img_logo)
logo.place(x=0, y=0)

lab = Label(window, text='Курс валют \n MAXIMUM банк', fg='black', font='Arial 22')
lab.place(x=150, y=25)

course_info = Label(window, text='Курс на: ' + today.replace('/', '.'), font='Arial 18' )
course_info.place(x=90, y=150)

usd_course = Label(window, text='$ ' + getCourse ('R01235'), font='Arial 16' )
usd_course.place(x=100, y=190)

eur_course = Label(window, text='€ ' + getCourse('R01239'), font='Arial 16')
eur_course.place(y=230, x=100)

window.mainloop()